Also called De Stijl. An art movement advocating pure abstraction and simplicity ? form reduced to the rectangle, and color to the primary colors, along with black and white. Piet Mondrian (Dutch, 1872-1944) was the group's leading figure. He published a manifesto titled Neo-Plasticism in 1920. Another member of this movement, painter Theo van Doesberg (Dutch, 1883-1931) started a journal named De Stijl in 1917, which continued publication until 1928, spreading the theories of the group. It also included the painter George Vantongerloo (Belgian,1886-1965), and the architects J.J.P. Oud (1890-1963) and Gerrit Rietveld (Dutch, 1888-1965). Their work exerted tremendous influence on the Bauhaus and the International Style.