Mathematics and art through the strings as with a bird cage and to see one form within another which excited me." The artists Theo van Doesburg and Piet Mondrian founded the De Stijl movement, which they wanted to "establish a visual vocabulary elementary geometrical forms comprehensible by all and adaptable to any discipline". Many of their artworks visibly consist of ruled squares and triangles, sometimes also with circles. De Stijl artists worked in painting, furniture, interior design and architecture. After the breakup of De Stijl, Van Doesburg founded the Avant-garde Art Concret movement, describing his 1929–1930 "Arithmetic Composition", a series of four black
Charley Toorop Bergense School. Toorop befriended other artists, among them Bart van der Leck and Piet Mondriaan. In 1926 Charley Toorop went to live for two years in Amsterdam, where her painting became influenced by film. Frontally depicted figures stand isolated from each other, as if lit by lamps at a movie set. Her still lifes show kinship to the synthetic cubism of Juan Gris. From the 1930s onwards, she painted many female figures, as well as nudes and self-portraits in a powerful, realistic style. Well-known is her large painting "Three Generations" ("Drie generaties") (1941–1950; in the Museum Boijmans Van Beuningen, Rotterdam),