He created a suprematist 'grammar' based on fundamental geometric forms; in particular, the square and the circle. In 1915, Malevich exhibited his early experiments in suprematist painting. The centerpiece of his show was the "Black Square", placed in what is called the "red/beautiful corner" in Russian Orthodox tradition, the place of the main icon in a house. "Black Square" was painted in 1915 and was a breakthrough in his career and in art in general. Malevich also painted "White on White" which marked a breakthrough from polychrome to monochrome suprematism.