An early 20th-century school of painting and sculpture in which the
subject matter is portrayed by geometric forms without realistic detail,
stressing abstract form at the expense of other pictorial elements largely by
use of intersecting often transparent cubes and cones.
Cubism is conventionally understood to refer
to the highly influential 20th century visual arts style created principally by
the painters Pablo Picasso and Georges Braque in Paris between 1907 and
1914. The Cubist style emphasized the flat, two-dimensional surface of the
picture plane, rejecting the traditional techniques of perspective,
foreshortening, modeling, and chiaroscuro and refuting time-honoured
theories of art as the imitation of nature. Cubist painters were not bound to
copying form, texture, colour, and space; instead,
they presented a new reality in paintings that depicted radically fragmented
objects, whose several sides were seen simultaneously.
Cubism provides a helpful site
on all things cubist
A Treatise on Cubism can be found here
Many examples can be found following this link
These Pictures represent two stages in Pablo
Picasso’s Cubist period:

Pablo Ruiz Picasso
Maisons sur la colline (Horta de
Ebro). Horta.
Summer/1909. 65 x 81
cm. Oil on canvas. Museum of
Modern Art, NYC

Three Women
This
next example is by Igal Koshevoy

"Wratheon,"
Igal Koshevoy
For anyone wanting to know about MA programs in
art education follow this link to Masters
in Art Education