The world as a sense, independent of the image, of the idea - this is the essence of the content of art. [My] square is not an image, just as a switch or socket are not the current. - Malevich

Malevich, in his letter to Konstantin Rozhdestvenskii, 21 April, 1927, private archive, Moscow (transl. Todd Bludeau); as quoted by Vasilii Rakitin, in The great Utopia - The Russian and Soviet Avant-Garde, 1915-1932; Guggenheim Museum, New York, 1992, p. 27