Depiction of three-dimensional objects and spatial relationships on a two-dimensional plane.
In Western art, illusions of volume and space are generally created by use of the linear perspective system, based on the observation that objects appear to shrink and parallel lines to converge at an infinitely distant vanishing point as they recede in space from the viewer. The vanishing point may have been known to the Greeks and Romans but had been lost until Paul Cézanne flattened the conventional picture plane. The Cubists and other 20th-century painters abandoned depiction of three-dimensional space altogether. See also {{link=aerial perspective">aerial perspective .