Malevich's epochal invention was works of art in which color and form become autonomous and the color surface, in other words the facture, acquired intrinsic value. The form of the square, invented in 1913, became a symbol of modern art, the archetypal image of a rational language of art. The square as an elementary base form of non-objective art constituted, and still constitutes, a challenge for many artists, and is the occasion for many a work of art. Это и многое другое вы найдете в книге Kasimir Malevich: Life and Work (Jeannot Simmen, Kolja Kohlhoff)