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because they reflect
The illusion of depth on a flat surface.
Tromp l'oeil is an art technique meant to create extremely realistic imagery through paint, resulting in an optical illusion making the figures within a painting seem three-dimensional rather than two-dimensional.A wonderful example of this technique would be the Triumph of the Barberini, which is a ceiling fresco done in 1633-1639 by Pietro de Cortona during the Baroque period.
"Several artists created the illusion of motion by applying the visual results of multiple-exposure photography to their paintings" (p.65) Rathus, Lois Fichner. Understanding Art (2009).
atmospheric perspective
One technique is that forground figurs are larger and lower than background figures.
linear perspective :)
A technique in which two or more vanishing points are used to create the illusion of depth on a flat surface..
visual
One artistic technique used to create the illusion of three dimensions is perspective drawing. This involves using vanishing points and geometric principles to represent objects in a realistic way on a two-dimensional surface. Another technique is shading or chiaroscuro, which uses variations in light and shadow to create the illusion of depth and volume in a artwork.
Forced perspective is the technique that is used when the size of objects and people in the background is diminished to create the illusion of greater foreground-to-background distance.
cross hatching
A multiple point perspective is a technique in which two or more vanishing points are used to create the illusion of depth on a flat surface
A multiple point perspective is a technique in which two or more vanishing points are used to create the illusion of depth on a flat surface
18th century Japanese woodblock prints
A drawing using tone is called a chiaroscuro. This technique involves using contrasts of light and shadow to create the illusion of volume and depth in the drawing.
Overlapping refers to the placement of an object to create the illusion of depth.