Cubism was an early 20th century avant-garde art movement that revolutionized painting and sculpture. Pioneered by Georges Braque and Pablo Picasso, Cubism involved analyzing subjects from multiple viewpoints and reassembling them in an abstracted form rather than a single perspective. Cubism had two phases - analytical cubism focused on geometric constructions, while synthetic cubism incorporated collage materials. Cubism influenced related movements in music, literature and was applied to sculpture and architecture through simplified geometric shapes and fragmentation of form.