Kazimir Malevich, a prominent figure in the Russian avant-garde movement, proposed that the square was the supreme form of non-objective art. He believed that the square, being a simple geometric shape, could express a sense of purity and universality. Malevich's work, particularly his 'Black Square' paintings, exemplified this philosophy by presenting a stark black square against a white background, which he considered to be the ultimate representation of artistic freedom and abstraction. This approach marked a significant departure from traditional representational art, emphasizing the importance of form and color over subject matter.