Why did so much of Kasimir Malevich's Suprematist art depend on the square?

Kasimir Malevich's Suprematist art heavily relied on the square as it represented a fundamental geometric form, embodying purity and balance. The square symbolized a departure from traditional representation, allowing for a focus on color, shape, and emotion rather than recognizable subjects. Additionally, Malevich viewed the square as a means to express a new visual language and a spiritual connection to the infinite, aligning with his quest for a transcendent experience in art.