Kazimir Malevich was a Russian painter and art theorist, best known for founding the Suprematism movement, which emphasized basic geometric forms and a limited color palette. His most famous work, Black Square, created in 1915, is considered a pivotal piece in modern art, representing a break from traditional representation. Malevich's work focused on the idea of pure artistic expression, free from the constraints of the physical world. He believed that art should convey feelings and ideas through abstraction, influencing many later movements, including Constructivism and Abstract Expressionism. His legacy continues to impact contemporary art today.