History of painting group's theories. Next to van Doesburg, the group's principal members were the painters Piet Mondrian, Vilmos Huszár, and Bart van der Leck, and the architects Gerrit Rietveld, Robert van 't Hoff, and J. J. P. Oud. The artistic philosophy that formed a basis for the group's work is known as "neoplasticism" — the new plastic art (or "Nieuwe Beelding" in Dutch). Proponents of De Stijl sought to express a new utopian ideal of spiritual harmony and order. They advocated pure abstraction and universality by a reduction to the essentials of form and colour; they simplified visual compositions to the vertical
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),