Modern art emerged in the early 20th century as artists rejected old styles and sought new forms of expression. Modernism was characterized by avant-garde styles that broke with tradition and shocked audiences. Key movements included Fauvism, Cubism, Futurism, Suprematism, De Stijl, Dadaism, and Surrealism. These movements experimented with abstraction, non-objective forms, collage, and incorporating found objects. In the postwar era, Abstract Expressionism became a major new style in America, exemplified by Pollock's action paintings. Minimalism in the 1960s featured purer geometric forms and an emphasis on materials.