Cubism was an influential early 20th century avant-garde art movement that revolutionized European painting and sculpture. Led by Pablo Picasso and Georges Braque, Cubism involved depicting subjects from multiple viewpoints to represent the subject in a multidimensional way. Cubism was divided into two phases - Analytic Cubism from 1907 to 1912 focused on geometric forms, while Synthetic Cubism from 1912 to 1919 incorporated collage materials into compositions. Cubism's radical approach to depicting subjects without traditional perspective had a significant impact on modern art and design.