Picasso’s prolific inventiveness and technical versatility made him the dominant figure in avant-garde art in the first half of the 20th century. Following his Blue Period (1901-4) and Rose Period (1905-6), Les Demoiselles d’Avignon (1907) signalled his development of cubism (1908–14). In the 1920s and 1930s he adopted a neoclassical figurative style and produced semi-surrealist paintings using increasingly violent imagery, notably The Three Dancers (1935) and Guernica (1937).