Showing posts with label leonardo. Show all posts
Showing posts with label leonardo. Show all posts

Monday

Art History: Raphael

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Raphael

 
 


Stanza della Segnatura
Raphael School of Athens 1509-1510
fresco
from Raphael 
Last years in Rome.
Raphael was called to Rome toward the end of 1508 by Pope Julius II at the suggestion of the architect Donato Bramante. At this time Raphael was little known in Rome, but the young man soon made a deep impression on the volatile Julius and the papal court, and his authority as a master grew day by day. Raphael was endowed with a handsome appearance and great personal charm in addition to his prodigious artistic talents, and he eventually became so popular that he was called "the prince of painters." Raphael spent the last 12 years of his short life in Rome. They were years of feverish activity and successive masterpieces. His first task in the city was to paint a cycle of frescoes in a suite of medium-sized rooms in the Vatican papal apartments in which Julius himself lived and worked; these rooms are known simply as the Stanze. The Stanza della Segnatura (1508-11) and Stanza d'Eliodoro (1512-14) were decorated practically entirely by Raphael himself; the murals in the Stanza dell'Incendio (1514-17), though designed by Raphael, were largely executed by his numerous assistants and pupils.
The decoration of the Stanza della Segnatura was perhaps Raphael's greatest work. Julius II was a highly cultured man who surrounded himself with the most illustrious personalities of the Renaissance. He entrusted Bramante with the construction of a new basilica of St. Peter to replace the original 4th-century church; he called upon Michelangelo to execute his tomb and compelled him against his will to decorate the ceiling of the Sistine Chapel; and, sensing the genius of Raphael, he committed into his hands the interpretation of the philosophical scheme of the frescoes in the Stanza della Segnatura. This theme was the historical justification of the power of the Roman Catholic church through Neoplatonic philosophy.
The four main fresco walls in the Stanza della Segnatura are occupied by the "Disputa" and the "School of Athens" on the larger walls and the "Parnassus" and "Cardinal Virtues" on the smaller walls. The two most important of these frescoes are the "Disputa" and the "School of Athens." The "Disputa," showing a celestial vision of God and his prophets and apostles above a gathering of representatives, past and present, of the Roman Catholic church, equates through its iconography the triumph of the church and the triumph of truth. 
 "Last years in Rome.."   Britannica 2001 Standard Edition CD-ROM.   Copyright © 1994-2001 Britannica.com Inc.   December 3, 2002. 
The "School of Athens" is a complex allegory of secular knowledge, or philosophy, showing Plato and Aristotle surrounded by philosophers, past and present, in a splendid architectural setting; it illustrates the historical continuity of Platonic thought. The "School of Athens" is perhaps the most famous of all Raphael's frescoes, and one of the culminating artworks of the High Renaissance. Here Raphael fills an ordered and stable space with figures in a rich variety of poses and gestures, which he controls in order to make one group of figures lead to the next in an interweaving and interlocking pattern, bringing the eye to the central figures of Plato and Aristotle at the converging point of the perspectival space. The space in which the philosophers congregate is defined by the pilasters and barrel vaults of a great basilica that is based on Bramante's design for the new St. Peter's in Rome. The general effect of the fresco is one of majestic calm, clarity, and equilibrium.  "Last years in Rome.."   Britannica 2001 Standard Edition CD-ROM.   Copyright © 1994-2001 Britannica.com Inc.   December 3, 2002. 

 
Raphael put portraits of important and influential people in the painting as a way to express the idea that the new Papal court was an updated, yet Catholic, school of Athens. Raphael uses Leonardo's face as a model for Plato, who gestures up.

Zoroaster, Ptolemy, Raphael and Sodoma One of the skills that most painters needed to develop during the Renaissance period was the ability to paint portraits and accurate likenesses.  Often this skill was developed by painting with a the only model that one might have available which is one's self.  The humanistic and platonic idea of perfectibility also gave rise to self reflection and observation and in this case, self aggrandizement.  A portrait then is not just about the immediate appearance but also it is a symbol of the person.  In this image we see that the artist is studying himself and also demonstrating his ability to create a strong physical likeness as well a psychological likeness.

Raphael, Self Portrait, 1506



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Art History: Leonardo

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"Man is the measure of all things."
 
Leonardo da Vinci, Self Portrait, 1512
Form:  The formal qualities of this drawing are not as significant as the iconographic and contextual qualities it represents.  The drawing is a fine representation of the human head and face and demonstrates a close attention to proportion, detail, and texture.  The diagonal lines that run from the upper left hand corner of the drawing and flow down to the lower right unify the drawing and make a cohesive value structure by flowing along like waves against the direction of the light source which is coming from the upper right hand corner.  The use of line and cross hatch marks to create texture and chiaroscuro are typical of Leonardo's style especially in his drawing and are complimented in their contrast to the types of lines that he uses to depict the hair which are long, flowing and curvilinear.  Iconography:  This drawing was probably a fairly quick "sketch" by Leonardo and the artist probably did not intend for the drawing to be deeply symbolic, nevertheless, to us it is.  Because the drawing was drawn from direct observation it is a snapshot of Leonardo's penetrating gaze.  As a viewer it is easy to imagine that this drawing and his facial expression sum up some of the qualities of this intense individual.  Interestingly enough, he looks kind of grumpy in the drawing but most accounts describe him as a witty and charming individual.
One of the skills that most painters needed to develop during the Renaissance period was the ability to paint portraits and accurate likenesses.  Often this skill was developed by painting with a the only model that one might have available which is one's self.  The humanistic and platonic idea of perfectability also gave rise to self reflection and observation.  A portrait then is not just about the immediate apprearance but also it is a symbol of the person.  In this image we see that Leonardo is studying himself and also demonstrating his ability to create a strong physical likeness as well a psychological likeness.
Context:  Here is Leonardo's letter to the Duke of Milan asking for employment,
To My Lord the Duke of Milan, Florence, 1482 Most Illustrious Lord,
Having until now sufficiently studied and examined the experiments of all those who claim to be experts and inventors of war machines, and having found that their machines do not differ in the least from those ordinarily in use, I shall make so bold, without wanting to cause harm to anyone, as to address myself to Your Excellency to divulge my secrets to him, and offer to demonstrate to him, at his pleasure, all the things briefly enumerated below :
1. I have the means to construct light, solid and sturdy bridges, easy to transport, in order to follow and if necessary rout the enemy, and other even more solid which resist fire and storm, simple to remove and lay down. And the means to burn and destroy those of the enemy.
2. For the siege of a stronghold, I know how to clear the moats of water and construct an infinite number of bridges, battering-rams and scaling-ladders and other machines useful for this sort of enterprise.
3. Item, if a stronghold could not be reduced by bombardment, because of the height of its slopes or the strength of its position, I have the means of destroying any citadel or other emplacement whose foundations do not rest upon the ground.
4. I also have methods for making mortars that are simple and practical to move, that throw rubble in an almost steady stream, causing much fear and terror in the enemy camp with their smoke, as well much damage and confusion.
5. Item, I also have the means, using tunnels and twisting secret passageways, dug noiselessly, of arriving at a determined point, even if this meant going under moats and rivers.
6. Item, I shall make sure and invincible covered wagons, which will penetrate the ranks of the enemy with their artillery, and that group of armed men does not yet exist which can stop them; infantry can then follow them unharmed and unobstructed.
7. Item, if necessary I shall make siege guns, mortars and other machines, of beautiful and practical shape, completely different from what is generally in use.
8. Wherever the use of cannon is impossible, I shall forge catapults, mangonels, trabocchi and other admirably effective engines, generally little used. In short, according to the situation, I shall manufacture an indefinite number of various machines, both offensive and defensive.
9. And if, by chance, the engagement took place at sea, I have plans for the construction of engines quite suited to attack or defense, of vessels which resist the fire of the largest guns, powder, and smoke.
1O. In time of peace, I believe I am capable of giving you as much satisfaction as anyone, whether it be in architecture, for the construction of public or private buildings, or in bringing water from one place to another. Item, I can sculpt in marble, bronze or terracotta; while in painting, my work is the equal of anyone¹s. What is more, I shall undertake the execution of the bronze horse which will be the immortal glory, eternal homage, to the beloved memory My Lord Your Father, and to the illustrious house of Sforza. And if one or another of the things listed above seems impossible or impractical, I should be pleased to demonstrate on your grounds or in any other place which may please Your Excellency, of whom I beg to remain the most humble servant.
Leonardo da Vinci
quoted from Artists on Art, from the 14th to the 20th Century, edited by Robert Goldwater and Marco Treves, (New York, Pantheon Books)

Notice that he begins his letter by telling the Duke all about his abilities as a scientist, inventor, and strategist and end at the end of the letter he says "Oh by the way, I'm an artist too."  What this anecdote indicates is that Leonardo was the quintessential Renaissance man.  Although this story indicates that Leonard is portraying himself as a scientist philosopher and architect first, this is just a dramatic way of introducing himself.   Leonardo new full well that his reputation as an artist preceded him.
A link to a biography about Leonardo.
 
 
 

Leonardo da Vinci, Last Supper, 1495-7 Milan, 
Santa Maria delle Grazie 


1) The door was enlarged in 1652
2) Half a dozen well meaning restorers seem to have been its worst enemy.
3) A protective curtain hung by friars in 1768 
trapped humidity and abraded the mural when opened for visitors.
4) To ward against sunlight, nearby windows are now boarded.
5) Post world war rebuilding added central heating which 
stabilized the environment.
6) The foundations of the structure were strengthened.
(Source: National Geographic Magazine)
Form: The Last Supper is a mural in bad condition.  Leonardo used a combination of materials to paint this fresco and his experiment failed almost immediately.  Leonardo painted a lead white primer on top of the plaster wall to slow the drying and so he could paint more slowly.  It's not clear why the two didn't adhere but possibly the moisture of the plaster wall rejected the oil based primer on its surface and kept it from creating a tight cohesive bond.  As a result the paint almost immediately began to flake.  For some detail views of the fresco and its context see this page. The figures are life sized and placed in a single frieze like band on one side of the table.  The apostles are also arranged into four groups of three figures each.  Each figure in the group is posed or arranged in a unique manner and exhibits a unique emotional gesture.  The composition is symmetrical with Christ at it's center and arranged using one point perspective whose vanishing point converges behind Christ's head.  Almost all of the figures, except for the single figure of Judas have their heads' placed on the horizon line.
The use of linear perspective is exaggerated and further complimented by the arrangement of the coffers in the ceiling, the doors along each side of the room and the atmospheric perspective of the landscape through the windows.  This is further exaggerated by the gesture of Christ's body in the center whose arms are outstretched and whose body forms a triangular shape that points back towards the window and the vanishing point.
Iconography: The figures size and placement in a single frieze like band on one side of the table.  Serve two purposes.  First, they arrange the figures in such a way that the monks who would eat in this room felt as if they were pulling up a chair and eating with Jesus and the apostles.  Second, the arrangement also refers to the classical friezes that Leonardo would have studied and this reference would not have been lost on the viewers. 
The apostles arrangement into four groups of three figures is a reference to the sacred number of the trinity which represents the father, son, and the holy spirit.  This symbolism could also be part of why there are three windows in the background and is also part of why Christ's figure is arranged in the three sided triangular form. 
For Leonardo and his contemporaries, humanism or the human experience of religion was the key to unlocking the world.  Since the study of man and his experience was so important it makes sense that human gesture and pose is central to understanding this painting.  Here's a quote from Leonardo's notebook in which he discusses how to compose groups of figures in historical pictures:
 
When you have thoroughly learned perspective and have fixed in your memory all the various parts and forms of things, you should often amuse yourself, when you take a walk for recreation, by watching and taking note of the attitudes and actions of men as they talk and dispute, or laugh or come to blows one with another - both their actions and those of the bystanders who either intervene or stand looking on at these things; noting them down with rapid strokes in this way, in a little pocket book, which you ought always to carry with you.
quoted from Artists on Art, from the 14th to the 20th Century, edited by Robert Goldwater and Marco Treves, (New York, Pantheon Books)
As you can see, Leonardo believed in drawing from figures from observation and that he particularly was interested in communicating emotion and experience through gesture.  Christ's pose, with his arms outstretched is further invitation to the scene and an indication in which he is willing participant in his sacrifice.  Each apostles' figure is posed or arranged in a unique manner and exhibits a unique emotional gesture.  This refers back to the viewer and how the viewer might have had a similar reaction to one of the apostles.  This is a humanistic way of looking at the story because the viewer is supposed to look for a figure that he best identifies with.  The composition is arranged using one point perspective whose vanishing point converges behind Christ's head which places him in the most important and literally the most central location in the image.  All of the figures, except for the single figure of Judas have their heads' placed on the horizon line and this is symbolic of Judas status as a betrayer and therefore "beneath" the other apostles.
Context:  Since Leonardo was a scientist as well as a painter he attempted to try mixing tempera, oil paint and fresco in this painting.  The result was that the mural almost immediately had a really bad "dandruff" problem. The drawing condenses misfortunes the "Last Supper" has suffered and reveals modern correction.
Leonardo painted a lead white primer on top of the plaster wall to slow the drying and so he could paint more slowly.  It's not clear why the two didn't adhere but possibly the moisture of the plaster wall rejected the oil based primer on its surface and kept it from creating a tight cohesive bond.



Leonardo, Vitruvian Man, 
Study of proportions, c1492 
from Vitruvius's 
De Architectura (1st century BCE)
Pen and ink, 13"x 9" 
Gallerie dell'Accademia, Venice
Form: This is a fairly small pen and ink drawing, depicting a nude male figure whose body is inscribed within several geometric forms.  The rendering utilizes contour drawing rather than much attempt to portray value or chiaroscuro.   In the margins of the pages are inscribed in reverse (or mirror writing) Leonardo's observations about Vitruvius's' text.  The drawing is an interpretation of these ideas which are quoted in Stokstad. (Make sure you read them!) Iconography:  In a more general sense, this drawing represents Leonardo and his contemporaries neoplatonic and humanistic ideologies which can be traced back to the writings of Vitruvius and classical thinking.  The most relevant humanistic "sound bite" from that era being, "Man is the measure of all things."  In this drawing we see that Leonardo takes this idea almost quite literally and scientifically.
In addition to the idea of "man" in a general sense, Leonardo, consistent with classical thinking, chooses to represent the nude male figure rather than the nude female.  This choice is quite deliberate because much of the thinking concerning classical humanism revolves around the specifically male experience of the world.
Context:  Leonardo's notebooks are precisely and this is why Bill Gates has bought them all up and now owns all the rights to them.  Aside from their initial value as antique works by a master, they are an invaluable source of information for modern scholars concerning both how Leonardo thought about the world and also how an artist from the Renaissance might have thought.  Within its pages are his observations concerning science, art, his inventions of flying machines, his studies of anatomy, observations of his fellow man and commentaries on other's ideas and texts. 
In Stokstad you can read the quote from Vitruvius' treatise.  Here's another quote from Leonardo that applies to how he thought about the human figure in a rationalistic and scientific manner.
 
From chin to the starting of the hair is a tenth part of the figure.
From the chin to the top of the head is an eighth part.
And from the chin to the nostrils is a third a part of the face.
And the same from the nostrils to the eyebrows, and from the eyebrows to the starting of the hair.
If you set your legs so far apart as to take the fourteenth part from the height, and you open and raise your arms until you touch the line of the crown of the head with your middle fingers, you must know that the center of the circle formed by the extremities of the outstretched limbs will be the navel, and the space between the legs will form an equilateral triangle.
The span of a man's outstretched arms is equal to his height. quoted from Artists on Art, from the 14th to the 20th Century, edited by Robert Goldwater and Marco Treves, (New York, Pantheon Books)

According to the Brittanica
Vitruvius
 fl. 1st century BC in full MARCUS VITRUVIUS POLLIO, Roman architect, engineer, and author of the celebrated treatise De architectura (On Architecture), a handbook for Roman architects. Little is known of Vitruvius' life, except what can be gathered from his writings, which are somewhat obscure on the subject. Although he nowhere identifies the emperor to whom his work is dedicated, it is likely that the first Augustus is meant and that the treatise was conceived after 27 BC. Since Vitruvius describes himself as an old man, it may be inferred that he was also active during the time of Julius Caesar. Vitruvius himself tells of a basilica he built at Fanum (now Fano). De architectura was based on his own experience, as well as on theoretical works by famous Greek architects such as Hermogenes. The treatise covers almost every aspect of architecture, but it is limited, since it is based primarily on Greek models, from which Roman architecture was soon decisively to depart in order to serve the new needs of proclaiming a world empire. De architectura is divided into 10 books dealing with city planning and architecture in general; building materials; temple construction and the use of the Greek orders; public buildings (theatres, baths); private buildings; floors and stucco decoration; hydraulics; clocks, mensuration, and astronomy; and civil and military engines. Vitruvius' outlook is essentially Hellenistic. His wish was to preserve the classical tradition in the design of temples and public buildings, and his prefaces to the separate books of his treatise contain many pessimistic remarks about the contemporary architecture. Most of what Pliny says in his Natural History about Roman construction methods and wall painting was taken from Vitruvius, though unacknowledged. Vitruvius' expressed desire that his name be honoured by posterity was realized. Throughout the antique revival of the Renaissance, the classical phase of the Baroque, and in the Neoclassical period, his work was the chief authority on ancient classical architecture.
The text of De architectura with an English translation is published in the Loeb Classical Library in two volumes.
 "Vitruvius."   Britannica 2001 Standard Edition CD-ROM.   Copyright © 1994-2001 Britannica.com Inc.   November 11, 2002.

Anatomical studies from Leonardo's notebooks

Even though it was against the law, Leonardo was still able to obtain corpses and dissect them.  Leonardo's studies of anatomy initially make sense from a rationalistic point of view for artists.  He states in one of his notebooks, It is a necessary thing for a painter, in order to be able to fashion limbs correctly in the positions and actions which they can represent in the nude, to know anatomy of sinews, bones, muscles, and tendons in order to know, in the various different movements and impulses, which sinew or muscle is the cause of each movement and to make only those prominent and thickened, and not the others all over the limb, as do many who, in order to appear great draftsmen, make their nudes wooden and without grace, so that it seems rather as if you were looking at a sack of nuts than a human form or a bundle of radishes rather than the muscles of nudes.
quoted from Artists on Art, from the 14th to the 20th Century, edited by Robert Goldwater and Marco Treves, (New York, Pantheon Books)
So then, you may ask yourself, why did he choose to study an unborn child in the womb.  The answer is that he was a Renaissance man an interested also in pure science.

A flying machine by Leonardo.

Leonardo, Virgin and St. Anne with the Christ Child 
and the Young John the Baptist. c 1500-1 
Charcoal heightened with white on brown paper, 
54x39" (139x101 cm)
National Gallery, London
Form:  This is a large drawing on brown paper that uses the brown of the paper as part of its value structure.  The medium brown tone of the paper served as the middle tones of the drawing and then the lights and darks were established with chalk and charcoal.  In several sections of the drawing, Leonardo has chosen to leave sections unfinished in terms of value and we can see contour lines that indicate the forms.  Some of the contour lines are rough and several have some "false" starts and corrections he made.
The overall composition is fits the figures in a pyramidal form in the foreground of the image.  The relationship of the figures although placed within a stable triangular form is still somewhat awkward and it looks almost as if Leonardo has collaged the figures together.  In the background of the image is an idealized landscape.
Iconography:  The iconography of the image deals with the holy family in a humanistic fashion.  This holy family and its gestures are meant to relate to your own family and this ties in with the Catholic humanist ideal of seeing the image of Christ in the world that surrounds you and with the concept of traditional family values.
The concept of faith, sacrifice, wisdom and idealism are related almost in a river like flow from Anne all the way down to St. John.  The start or source of this knowledge comes from "God the Father" who is not represented but pointed towards by St. Anne, Mary's mother on whom Mary sits.  In some ways, this refers back to the "throne of wisdom" them that was evidenced in Giotto and Cimabue's painting but in this case, Leonardo's drawing is a correction of the original schema.  In this case, St. Anne becomes the original throne on which Mary rests.
From Anne comes Mary, who offers her child to the world and he in turn offers his blessing, in the form of a gesture, and therefore wisdom, to the apostle John who will go and relate the "good news" to his followers.
From another perspective, this image also communicates the point of view of the Renaissance audience about the roles of women.  The women in this image are in some ways representative of the "ideal" woman.  Clearly an image like this incorporates the point of view that motherhood is a very high calling.  Since images like this were primarily commissioned by male patrons and made by male artists some historians have named this phenomena the "male gaze."
Context:  This large drawing is neither a study of a finished drawing for presentation in the strictest sense.  Although in some ways it is both.  This drawing is a cartoon and is a planning drawing or design.  In some ways it's a form of carbon paper.  The drawing would have been used in a similar fashion to the paper designs dress makers use.  The drawing would have been pierced with a pin or awl along its main contours and then the image would have been transferred to a canvas or board by "pouncing" charcoal or chalk through the holes created by the pin. 
Stokstad explains that there is no finished painting associated with this drawing, however, Leonardo has several paintings that are very similar to it.  It was not unknown of and actually a fairly common practice to recycle old cartoons, and the basic designs of paintings over and over again.  For example, Cimabue has several version of the seated Madonna that look almost identical but for minor differences in color, iconography the number of angels and the apostles who accompany her.  This may account for the weird interrelationship and tangle of legs between Mary and Anne in the image.  It is possible that Leonardo recycled and collaged some old ideas and figures in this cartoon.  Another painting that shares many of these qualities with this cartoon is Leonardo's Virgin and St. Anne with the Christ Child, 1510 now in the Louvre.

 

Leonardo, Virgin and St. Anne with the 
Christ Child. 1510
Oil on wood, 168,5 x 130 cm 
Musée du Louvre, Paris

Photo of atmospheric perspective
Iconography:  This work shares almost the same exact content as the cartoon above; however, in this the St. John is substituted with a lamb.  The lamb is symbolic of Christ as the Lamb of God and of his preordained sacrifice. Some minor changes dealing with the gestures and poses of the figures are in evidence.  Most noticeably is Anne's.  In this version she does not chose to gesticulate towards the heavens but instead places her hand on her hip in to compliment this self assured and calm gesture she smiles benevolently down on her progeny.
Formal: An element that blurs the line between iconography and formalism is the use of the triangular or pyramidal organization of the figures. This shape is both iconic of the Trinity and it is a visual device which pulls the eye back into the picture plane and stabilizes the composition.
The "cut and paste" of the three figures, especially in how the figure of Mary relates to the figure of St. Anne, can probably be traced back to the use of older studies or cartoons which Leonardo has combined.  This painting also shares a lot in common with his Mona Lisa.  The shared qualities involved deal with his creation of space by using two devices, the use of atmospheric or aerial perspective and the use of sfumato.
 
Alberti's system of linear perspective failed to solve many problems related to the effective portrayal of depth by limiting it to a horizon line and by giving the appearance that the various planes in a painting are stacked much like a stage set.3 By careful observation of nature as the ultimate teacher, Leonardo solves these problems, "Perspective is divided into three parts, of which the first is concerned solely with the outlines of the bodies; the second in the diminution of colors at varying distances; the third in the loss of definition of bodies at various distances."4 Leonardo observed and defined atmospheric perspective and color perspective which in combination are often referred to as "aerial perspective." Leonardo explains color perspective this way, ". . . through variations in the air we are made aware of the different distances of various buildings. . . therefore make the first building. . . its own color; the next most distant make more blue. . . at another distance bluer yet and that which is five time more distant make five times more blue."5 This principle is demonstrated in the background of Mona Lisa: the ground and hills directly behind the subject are painted in warm tones of reddish browns and tans. As the landscape recedes the mountains and water become progressively more blue. Leonardo also noted that air is more dense closest to the earth, therefore the bases of hills will always appear lighter than the summit; he applies this theory to the hills behind the sitter's shoulders which start out a tan color and become dark brown.6
Leonardo's optical observations delineated atmospheric perspective in this way: "[t]hat thing will be less evident that is furthest removed from the eye. The boundaries of things in the second plane will not be discerned like those in the first."7 This theory is especially well developed in the backgrounds of Mona Lisa and Madonna and Saint Anne, which become less and less detailed as the images recede until they become so distant to the eye that they disappear in the atmosphere. Leonardo's establishment of these principles brought to an end the medieval system of absolute color and allowed artists to compress miles of landscape onto a flat picture plane.8
Endnotes
1. Martin Kemp, ed., Leonardo on Painting, (New Haven and others: Yale University Press, 1989), 197.
2. Serge Bramly, Leonardo: Discovering the Life of Leonardo da Vinci, Sian Reynolds, trans., (New York: Harper and Collins Publishers, 1991),
3. William V. Dunning, Changing Image of Pictorial Space: A History of Spatial Illusion in Painting, (Syracuse: Syracuse University Press, 1991), 42.
4. Kemp, 16.
5. Kemp, 80.
6. Kemp, 83-84.
7. Kemp, 85-87.|
8. Marcia Hall, Color and Meaning: Practice and Theory in Renaissance Painting, (Cambridge: Cambridge University Press, 1994), 68.
The following is part of an essay excerpted from an art historical magazine published by Chico State called "Contrapposto"  which can be found at http://www.csuchico.edu/art/contrapposto/contrapposto99/pages/contents.html
"What Insights do Leonardo's Writings Shed on His Work?" by S. Lee Hager go to  this site for the full essay http://www.csuchico.edu/art/contrapposto/contrapposto99/pages/essays/art345/hagerl.html

 

 
 

Friday

How Linear Perspective Works (A Renaissance approach)



Perspective Webster's dictionary defines "perspective" in a variety of ways:
2 a: the interrelation in which a subject or its parts are mentally viewed ; also: point of view b: the capacity to view things in their true relations or relative importance
So perspective is really just a point of view.  This section will deal with a variety of points of view.  Visual systems such a linear perspective will be discussed as well theological, humanistic and neoplatonic points of view.

Cimabue, Madonna Enthroned c1280
Late Gothic Italian 

space,  picture plane, and overlapping Paintings on a flat two dimensional space employ different ways of creating space.  Before the Renaissance period artists looked at a picture as a kind of window.  The front of this window is sometimes referred to as the picture plane.  As you look through the front of the plane, like a window, you will see things that are in the foreground or front of the picture, then in the middle ground, and finally the background.  In this painting in particular, this artist, named Cimabue, is trying to create the illusion of space by layering or overlapping one figure in front of another, however, you can see that he really does not create the illusion of space or deep space too convincingly.


Giotto, St Francis Giving his Mantle to a Poor Man, c1305
Late Gothic sometimes his style is considered 
Proto Renaissance or Early Renaissance
Giotto, a student of Cimabue, is one of the first Italian artists to really try to create some sort of space in the picture plane.  If you look at this painting you can see that he has claerly created a foreground, where the men and the donkey are, a mid-ground, where the mountains start to rise, and then a background where the buildings are.  He creates this illusion in several ways.  One way is that he overlaps or layers the figures.  The other is that he uses dimunution.  Things in the background diminish, or get smaller.  Giotto creates space is that he changes the size of things as they move back in space.  The buildings and mountains are much smaller than the people are in the foreground.  This difference in size is refered to as a size scale relationship
The building in this image and the others like it are rendered with the illusion of space called intuitive perspective and isometric perspective.  (This kind of perspective is not as illusionistic as the linear perspective that is invented during the Renaissance around 1400 CE.)

Different artists and different cultures through out time have tried their hand at creating the illusion of space or realism in their art.
 

 

Fowling Scene from the tomb of Nebamun
1400 BCE - 1350 BCE
Thebes, Egypt
Dynasty 18
According to the Brittanica: Perspective is a method of graphically depicting three-dimensional objects and spatial relationships on a two-dimensional plane or on a plane that is shallower than the original (for example, in flat relief).
Perceptual methods of representing space and volume, which render them as seen at a particular time and from a fixed position and are characteristic of Chinese and most Western painting since the Renaissance, are in contrast to conceptual methods. Pictures drawn by young children and primitives (untrained artists), many paintings of cultures such as ancient Egypt and Crete, India, Islam, and pre-Renaissance Europe, as well as the paintings of many modern artists, depict objects and surroundings independently of one another--as they are known to be, rather than as they are seen to be--and from the directions that best present their most characteristic features. Many Egyptian and Cretan paintings and drawings, for example, show the head and legs of a figure in profile, while the eye and torso are shown frontally . This system produces not the illusion of depth but the sense that objects and their surroundings have been compressed within a shallow space behind the picture plane.


Leonardo da Vinci, Last Supper, 1495-7 Milan, 
Santa Maria delle Grazie 
According to the Brittanica:
In Western art, illusions of perceptual volume and space are generally created by use of the linear perspective system, based on the observations that objects appear to the eye to shrink and parallel lines and planes to converge to infinitely distant vanishing points as they recede in space from the viewer. Parallel lines in spatial recession will appear to converge on a single vanishing point, called one-point perspective. Perceptual space and volume may be simulated on the picture plane by variations on this basic principle, differing according to the number and location of the vanishing points. Instead of one-point (or central) perspective, the artist may use, for instance, angular (or oblique) perspective, which employs two vanishing points.

Linear perspective is a mathematical system for creating the illusion of space and distance on a flat surface. The system originated in Florence, Italy in the early 1400s. The artist and architect Brunelleschi demonstrated its principles, but another architect and writer, Leon Battista Alberti was first to write down rules of linear perspective for artists to follow. Leonardo da Vinci probably learned Alberti's system while serving as an apprentice to the artist Verrocchio in Florence. To use linear perspective an artist must first imagine the picture surface as an "open window" through which to see the painted world. Straight lines are then drawn on the canvas to represent the horizon and "visual rays" connecting the viewer's eye to a point in the distance.
The horizon line runs across the canvas at the eye level of the viewer. The horizon line is where the sky appears to meet the ground.
The vanishing point should be located near the center of the horizon line. The vanishing point is where all parallel lines (orthogonals) that run towards the horizon line appear to come together like train tracks in the distance.
Orthogonal lines are "visual rays" helping the viewer's eye to connect points around the edges of the canvas to the vanishing point. An artist uses them to align the edges of walls and paving stones.
Please visit this site for more of an explanation.
http://psych.hanover.edu/Krantz/art/linear.html

 

Masaccio, Trinity with Donors, c1425 - 8?
fresco in the 
Church of Santa Maria Novella, Florence
21'x10'5"
According to the Brittanica:
The early European artist used a perspective that was an individual interpretation of what he saw rather than a fixed mechanical method. At the beginning of the Italian Renaissance, early in the 15th century, the mathematical laws of perspective were discovered by the architect Filippo Brunelleschi, who worked out some of the basic principles, including the concept of the vanishing point, which had been known to the Greeks and Romans but had been lost. These principles were applied in painting by Masaccio (as in his "Trinity" fresco in Santa Maria Novella, Florence; c. 1427), who within a short period brought about an entirely new approach in painting. A style was soon developed using configurations of architectural exteriors and interiors as the background for religious paintings, which thereby acquired the illusion of great spatial depth. In his seminal Della pittura (1436; On Painting), Leon Battista Alberti codified, especially for painters, much of the practical work on the subject that had been carried out by earlier artists; he formulated, for example, the idea that "vision makes a triangle, and from this it is clear that a very distant quantity seems no larger than a point." Linear perspective dominated Western painting until the end of the 19th century, when Paul Cézanne flattened the conventional Renaissance picture space. The Cubists and other 20th-century painters abandoned the depiction of three-dimensional space altogether and hence had no need for linear perspective.
Linear perspective plays an important part in presentations of ideas for works by architects, engineers, landscape architects, and industrial designers, furnishing an opportunity to view the finished product before it is begun. Differing in principle from linear perspective and used by both Chinese and European painters, aerial perspective is a method of creating the illusion of depth by a modulation of color and tone. 

 
Dennis Hwang, a student from Stanford was so taken with the three dimensional quality of the image that he designed a virtual reality image that simulates another view of Masaccio's fresco. http://graphics.stanford.edu/courses/cs99d-98/online_projects.html

 


Masaccio, Trinity with Donors, c1425 - 8?
fresco in the Church of Santa Maria Novella, Florence
21'x10'5"
Form: This is a tremendous work of art.  The figures in the work are just slightly bigger than life size.  The overall composition of the works is symmetrical and the composition within the arch is based on a stable pyramidal form.  While not strictly in accordance with the rules of perspective, this form is a visual device that draws the eye back into the picture plane. The figures of God the Father, The Spirit (which is a Dove that doubles for God's collar) and the crucified Jesus are placed with a Roman triumphal arch complete with Pantheon like coffers and ionic columns on the edges.  Moving out of the arch on either side are two flattened pilasters (squared off half columns) that have corinthian capitals.
The work is executed in one point perspective with the horizon line placed right on the level of the first trompe l’oeil ledge at the viewer's eye level.   The figures representing the two donors or patrons are located on a ledge about six feet off the ground, just outside of the arch slightly above the viewer's point of view. Beneath the ledge/horizon line is a painted skeleton representing a tomb.
Iconography:  Symbolically speaking this image is packed with all kinds of different perspectives. 
The linear perspective is both a formal device, which creates space, and a way of including the viewer.  The fact that the use of linear perspective is used actually symbolizes that the real subject of the painting is not the Trinity but rather the Renaissance man's relationship to it.  This leads us to discuss the various themes that are hidden within the obvious meaning behind the fresco.
It's almost a shopping list of ideas. 
idealism
neoplatonism
humanism
theology
Overall, the fresco does represent a theological (religious) point of view.  More specifically it represents a unification of the Trinity as expressed in the Catholic Nicene Creed.
We believe in one God, the Father Almighty, maker of all things visible and invisible; and in one Lord Jesus Christ, the Son of God, the only-begotten of his Father, of the substance of the Father, God of God, Light of Light, very God of very God, begotten, not made, being of one substance with the Father.
The Brittanica refers to Masaccio's Trinity as "rational, human-scaled and human-centred, and inspired by the ancient world."  This statement illustrates that beyond a theological point of view, the naturalistic life-size scale and placement of the figures of God the Father, The Spirit, within a Roman triumphal arch complete with Pantheon like coffers and ionic columns on the edges, represents how the Renaissance person was framing their view of the world within a classicizing and humanistic point of view.  Jesus' body is idealized and he looks almost as if he is a Greek god.  God the Father looks like a Greek or Roman philosopher and these representations make reference to the new ideas concerning neoplatonism and humanism. The neoplatonic aspect, deals with the concept of humankind's ability to be perfected to an ideal state.  One that is more spiritual and mental than flesh.  The humanistic point of view deals with the concept that while humankind is spiritual it is also physical and emotional.  When the body of Christ is depicted as a real human's body, the artist is showing you a point of view based on a more human and possibly even fallible point of view of the world.  The perfectibility of man and the ideal conception of a what a perfect person should be is discussed in Mencher, Liaisons 109-112 Baldassare Castiglione (1478-1529) Il Cortegiano (The Courtier) Excerpts from "The First Book of the Courtier"  and William Shakespeare c1600 excerpts from Hamlet 115-117All of these points of view are pulled together in by the appearance and text above the skeleton.
Above the skeleton is inscribed, "What I was you are.  What I am, you will become."  This idea that we are to be reminded of our mortality and frailty is a reminder or a lesson referred to as a memento mori.  A literal reminder of death.  This them is taken up not just in the visual arts but also in literature and theatrical productions.  Read Mencher, Liaisons, William Shakespeare c1600 excerpts from Hamlet115-117 for another example.  What kinds of iconography to they both share?

Masaccio. Tribute Money, and Expulsion, fresco c1427 
Brancacci Chapel, Santa Maria del Carmine Florence, 
Italy, Italian Renaissance

Context: Masaccio. Tribute Money, and Expulsion, fresco c1427  are prime examples of many of the innovations that marked 15th century Italian art.  In addition to demonstrating all of the formal views concerning perspective, these frescoes also express all of the more philosophical points of view. According to the Brittanica: 
The Brancacci Chapel. Shortly after completing the Pisa Altarpiece, Masaccio began working on what was to be his masterpiece--the frescoes of the Brancacci Chapel (c. 1427) in the Florentine Church of Santa Maria del Carmine. He was commissioned to finish painting the chapel's scenes of the stories of St. Peter after Masolino (1383-1447) had abandoned the job, leaving only the vaults and several frescoes in the upper registers finished. Previously, Masaccio and Masolino were engaged in some sort of loose working relationship. They had already collaborated on a "Madonna and Child with St. Anne" (Uffizi Gallery, Florence) in which the style of Masaccio, who was the younger of the two, had a profound influence on that of Masolino. It has been suggested, but never proven, that both artists were jointly commissioned to paint the Brancacci Chapel. The question of which painter executed which frescoes in the chapel posed one of the most discussed artistic problems of the 19th and 20th centuries. It is now generally thought that Masaccio was responsible for the following sections: the "Expulsion of Adam and Eve" (or "Expulsion from Paradise"), "Baptism of the Neophytes," "The Tribute Money," "St. Peter Enthroned," "St. Peter Healing the Sick with His Shadow," "St. Peter Distributing Alms," and part of the "Resurrection of the Son of Theophilus." (A cleaning and restoration of the Brancacci Chapel frescoes in 1985-89 removed centuries of accumulated grime and revealed the frescoes' vivid original colours.)
There are other forms of perspective and one of them, which is slightly later development used by Masaccio but perfected by Leonardo is called aerial perspective.  According to the Brittanica,
 


Masaccio. Tribute Money, and Expulsion, fresco c1427 
Brancacci Chapel, Santa Maria del Carmine Florence, Italy, Italian Renaissance
Photo of atmospheric perspective 
Aerial perspective also called ATMOSPHERIC PERSPECTIVE, method of creating the illusion of depth, or recession, in a painting or drawing by modulating color to simulate changes effected by the atmosphere on the colours of things seen at a distance. Although the use of aerial perspective has been known since antiquity, Leonardo da Vinci first used the term aerial perspective in his Treatise on Painting, in which he wrote: "Colours become weaker in proportion to their distance from the person who is looking at them." It was later discovered that the presence in the atmosphere of moisture and of tiny particles of dust and similar material causes a scattering of light as it passes through them, the degree of scattering being dependent on the wavelength, which corresponds to the color, of the light. Because light of short wavelength--blue light--is scattered most, the colours of all distant dark objects tend toward blue; for example, distant mountains have a bluish cast. Light of long wavelength--red light--is scattered least; thus, distant bright objects appear redder because some of the blue is scattered and lost from the light by which they are seen. The intervening atmosphere between a viewer and, for example, distant mountains, creates other visual effects that can be mimicked by landscape painters. The atmosphere causes distant forms to have less distinct edges and outlines than forms near the viewer, and interior detail is similarly softened or blurred. Distant objects appear somewhat lighter than objects of similar tone lying closer at hand, and in general contrasts between light and shade appear less extreme at great distances. All these effects are more apparent at the base of a mountain than at its peak, since the density of the intervening atmosphere is greater at lower elevations.
 "aerial perspective."   Britannica 2001 Standard Edition CD-ROM.   Copyright © 1994-2001 Britannica.com Inc.   November 19, 2002. 

 


chiaroscuro
 
The picture plane is further unified by its value structure or shading.  This use of light and shadow to create a dramatic and consistent picture plane is  referred to as chiaroscuro. According to the Brittanica, 
 
Chiaroscuro (from Italian chiaro, "light"; scuro, "dark"),
technique employed in the visual arts to represent light and shadow as they define three-dimensional objects. Some evidence exists that ancient Greek and Roman artists used chiaroscuro effects, but in European painting the technique was first brought to its full potential by Leonardo da Vinci in the late 15th century in such paintings as his "Adoration of the Magi" (1481; Uffizi, Florence). Thereafter, chiaroscuro became a primary technique for many painters, and by the late 17th century the term was routinely used to describe any painting, drawing, or print that depends for its effect on an extensive gradation of light and darkness.
The scene depicted in "The Tribute Money" is consistently lit from the upper right and thus harmonizes with the actual lighting of the chapel, which comes from a window on the wall to the right of the fresco. The mountain background of the fresco is convincingly rendered using aerial perspective; an illusion of depth is created by successively lightening the tones of the more distant mountains, thereby simulating the changes effected by the atmosphere on the colours of distant objects. In "The Tribute Money," with its solid, anatomically convincing figures set in a clear, controlled space lit by a consistent fall of light, Masaccio decisively broke with the medieval conception of a picture as a world governed by different and arbitrary physical laws. Instead, he embraced the concept of a painting as a window behind which a continuation of the real world is to be found, with the same laws of space, light, form, and perspective that obtain in reality. This concept was to remain the basic idiom of Western painting for the next 450 years. 
 "chiaroscuro."  and "Masaccio"  Britannica 2001 Standard Edition CD-ROM.   Copyright © 1994-2001 Britannica.com Inc.   November 19, 2002. 
Although Giotto uses the technique somewhat in his paintings, notice how chiaroscuro is employed by Masaccio in the image on the left to make the figures appear more life like.  Also notice how Masaccio has become so involved with perspective that the halo atop the apostles heads are represented as an elliptical plates floating above rather than the more traditional circle of light that surrounds the heads of Giotto's and Cimabue's figures.
Context and Iconography:  In order to really understand this next section you need to know the story of the Tribute Money.  I think that what Masaccio was doing was following the lessons and type of sermons that would have been delivered in Church.  In these sermons, two stories concerning the testing of Jesus might have been combined.
 
Matthew Chapter 17


24  When they came to Capernaum, the collectors of the temple tax approached Peter and said, "Doesn't your teacher pay the temple tax?"


25 "Yes," he said. When he came into the house, before he had time to speak, Jesus asked him, "What is your opinion, Simon? From whom do the kings of the earth take tolls or census tax? From their subjects or from foreigners?"


26 When he said, "From foreigners," Jesus said to him, "Then the subjects are exempt.


27 But that we may not offend them, go to the sea, drop in a hook, and take the first fish that comes up. Open its mouth and you will find a coin worth twice the temple tax. Give that to them for me and for you."


Matthew Chapter 22


15  Then the Pharisees went off and plotted how they might entrap him in speech.


16 They sent their disciples to him, with the Herodians, saying, "Teacher, we know that you are a truthful man and that you teach the way of God in accordance with the truth. And you are not concerned with anyone's opinion, for you do not regard a person's status.


17 Tell us, then, what is your opinion: Is it lawful to pay the census tax to Caesar or not?"


18 Knowing their malice, Jesus said, "Why are you testing me, you hypocrites?


19 Show me the coin that pays the census tax." Then they handed him the Roman coin.


20 He said to them, "Whose image is this and whose inscription?"


21 They replied, "Caesar's." At that he said to them, "Then repay to Caesar what belongs to Caesar and to God what belongs to God."


22 When they heard this they were amazed, and leaving him they went away.
Masaccio also uses linear perspective to focus the attention on the viewer to the central figure of Christ.  In addition to this, he also places the heads of the apostles on the horizon line almost as if they were ducks in a shooting gallery. The Tribute Money is a continuous narrative.  Meaning that all the episodes of the story are united in one picture plane, such as we see in Nicola Pisano's Nativity, however in Masaccio's image the space makes more sense.  He also divides the story in three segments by using linear perspective.
The vanishing point also divides the picture plane in two sections.  On the left we see the mountains and natural world depicted almost as an infinite place.  To the right of the picture plane, and on the left hand of Jesus, the place where the damned are traditionally placed are the manmade structures of the city.
What this may represent is a concept that is expressed by the story of the Tribute Money as interpreted by St. Augustine 354-430.  According to the Brittanica, Augustine's, "adaptation of classical thought to Christian teaching created a theological system of great power and lasting influence. His numerous written works, the most important of which are Confessions and City of God, shaped the practice of biblical exegesis and helped lay the foundation for much of medieval and modern Christian thought."
St. Augustine, came up with a concept in which he viewed the universe and man's existence as divided in two worlds.  One was the City of Man which was temporary and fallible.  This is represented by the architecture and the place in which the tax collectors stands and collects what is "due Caesar."  The other world is the City of God which goes on forever and in which god will provide for the faithful.  This is where Peter pulls the coin from the fishes mouth. Stokstad points out that this story was also used as a propagandistic tool and a way of instilling patriotism for Florence and raising funds.
o Form:  These two nude figures are depicted in an anatomically accurate manner.  The angel of Michael above escorts them out of a triumphal arch and out into a seemingly featureless landscape.  The bodies are arranged in expressive poses. The torso of the angel floating above has been somewhat foreshortened.

Iconography:  The classical arch symbolizes the figures expulsion from a classical and ideal world: the Garden of Eden.  The expression of there bodies ties in with some of the ideas of human expression that one can see in monuments like the Parthenon's metopes and the Ara Pacis Augustae, except in this case, Masaccio uses the language of gesture to directly communicate what each one of these figures is feeling.  My Professor Broderick, from Lehman college, suggested that the figure of Adam is ashamed of himself in a more internal way and therefore hides his face from us and from God.  In contrast to this, Eve, is more superficially ashamed and hides her body.  For Broderick, this was an expression of male and female roles during the Renaissance.

 
 


Albrecht Durer, Alberti's Veil c1500
One way of dealing with perspective and foreshortening is to use mechanical devices to help the artist figure out how perspective works.  In the central image, Durer is using a device based on a treatise by Alberti.  This device allows the artist to abstract the image and chart the image into a series of squares.  This gives the artist many more reference points and allows him to check and measure the way things are foreshortened.
This machine is based on a device that artists used to make multiple copies of the same image or to enlarge a drawing accurately for placement on a wall or canvas.  This process is called "grid and transfer" or "squaring."  According to the Brittanica,
"Squaring" in painting, simple technique for transferring an image from one surface to another (and sometimes converting the image from one scale to another) by non mechanical means. The original work to be transferred is divided into a given number of squares; the same number of squares is then marked off-- with charcoal or some other easily removable medium--on the surface of the receiving area. The contents of each square of the original are then drawn in the corresponding square of the reproduction. The use of the grid ensures the accurate placement of images onto the reproduction. The Egyptians used squaring at least 5,000 years ago. It has been used to transfer cartoons onto murals, to transfer preparatory drawings onto canvas paintings, and to alter the scale of any work in the same media.
This process was used extensively during the Renaissance.  Check this out:
http://www.clevelandart.org/techniques/squaring.html also see this
http://www.aliciastrose.com/f-process.html
Two Point Perspective
 

1) To draw a simple shape in two point perspective you start with a single line across the picture plane called the horizon line.
 
3) Next, add converging lines from the top and bottom of the vertical line and draw two vertical lines which will become the back corners of the box.

2 Then add two vanishing points.  Place one at each end of the horizon line. Then draw a vertical line as big as you want the first box.
4) After erasing some of the horizon line (the part behind the box) it looks like a three dimensional form.
A page with a great example of two point perspective.
http://www.proviso.k12.il.us/EAST/GeometryWorld/2PER.HTM
 
 

Gustave Caillebotte, Paris a Rainy Day, 1877
French, Impressionism
Here's an example of two point perspective in a painting.  This painting actually has multiple points on the horizon line but I've traced most of the orthagonals to the two most dominant ones in the black and white illustration. Here's how Giotto kind of had it right.

 
Here's where the lines should have gone.

 
 
Giotto di Bondone, Virgin and Child Enthroned, 
(Ognissanti Altar,) c 1310. 
Tempera and gold on wood, 10'8"x6'8"
Galleria degli Uffizi, Florence
Cimabue, Virgin and Child Enthroned, 
from the Church of Santa Trinita, Florence
c 1280. Tempera and gold on wood, 12' 7"x7'4"
Galleria degli Uffizi, Florence


Masaccio, Madonna Enthroned, 1426,
oil on panel, 56x29"
London, National Gallery
These two works of art on the left are ones that you have already studied extensively.  Compare these two works to this one by Masaccio.  Think about and be prepared to relate the concepts you have just learned about to them.
Go back to the page where you first learned about them.
Ignore this question if you are in the ART 101 class.

hu.man.ism n (1832) 1 a: devotion to the humanities: literary culture b: the revival of classical letters, individualistic and critical spirit, and emphasis on secular concerns characteristic of the Renaissance 2: humanitarianism 3: a doctrine, attitude, or way of life centered on human interests or values; esp: a philosophy that usu. rejects supernaturalism and stresses an individual's dignity and worth and capacity for self-realization through reason -- hu.man.ist n or adj -- hu.man.is.tic adj -- hu.man.is.ti.cal.ly adv me.men.to mo.ri n, pl memento mori [L, remember that you must die] (1596): a reminder of mortality; esp: death's-head
me.men.to n, pl -tos or -toes [ME, fr. L, remember, imper. of meminisse to remember; akin to L ment-, mens mind--more at mind] (1580): something that serves to warn or remind; also: souvenir
Neo.pla.to.nism n (1845) 1: Platonism modified in later antiquity to accord with Aristotelian, post-Aristotelian, and oriental conceptions that conceives of the world as an emanation from an ultimate indivisible being with whom the soul is capable of being reunited in trance or ecstasy 2: a doctrine similar to ancient Neoplatonism -- Neo.pla.ton.ic adj -- Neo.pla.to.nist n
trompe l’oeil - (French: "deceive the eye"), in painting, the representation of an object with such verisimilitude as to deceive the viewer concerning the material reality of the object. This idea appealed to the ancient Greeks who were newly emancipated from the conventional stylizations of earlier art. Zeuxis, for example, reportedly painted such realistic grapes that birds tried to eat them. The technique was also popular with Roman muralists. Although trompe l’oeil never achieved the status of a major artistic aim, from the early Renaissance on, European painters occasionally fostered illusionism by painting false frames out of which the contents of a still life or portrait appeared to spill, or by creating window-like images suggesting actual openings in the wall or ceiling. (Brittanica)
Value Structure
Is the lightness or darkness of a color or shade.  Chiaroscuro and tenebrism both employ the use quick shifts of light and dark.
Value refers to the lightness or darkness of a color. It is a variable that can substantially alter a color's appearance, and as we will see later, it is also an important factor in achieving legibility with type and color. A hue changes in value when either white or black are added to it. A color with added white is called a tint (fig.7) ; a color with added black is called a shade (fig.8). Generally speaking, pure hues that are normally light in value (yellow, orange, green) make the best tints, white pure hues that are normally dark in value (red, blue, violet) make the most desirable shades. The palettes colors below shoes a spectrum of tints and shades based on the hues from the colors clearly shows that changes in value greatly expand color possibilities.
 
 

fig.7

fig.8