(Dutch: “Style”).  De Stijl was a movement founded in 1917 in Leiden, Holland, by painter Piet Mondrian, architect/painter/writer Theo van Doesburg, and painter/interior designer/graphic designer Bart van der Leck. Proponents of De Stijl advocated a universal visual language of pure abstraction, known as Neo-Plasticism, which could be achieved by simplifying compositions to vertical and horizontal lines and using only black, white and the primary colors. Pronunciation here. Web resource here.

Bart van der Leck.  Composition 1917 No. 3 (Leaving the Factory). Oil on canvas. 1917. Kröller-Müller Museum, Otterlo, The Netherlands.