Abstractionism emerged in the late 19th/early 20th centuries led by artists like Kandinsky, Malevich, and Mondrian who moved away from realistic representations towards geometric shapes and colors to represent emotions/ideas rather than physical objects. Key movements included Suprematism founded by Malevich using basic shapes without context, and De Stijl founded by Mondrian using only primary colors and horizontal and vertical lines. Mondrian's style evolved from Cubism into his signature grid-based geometric compositions divided by black lines and primary colors which came to define geometric abstractionism.