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
Piet van der Sanden camp near Hannover in Germany. Shortly after the war ended he joined the British intelligence service. Between 1945 and 1947 he worked as a translator for British occupying forces in Germany. While there Van der Sanden met his future wife. Between 1947 and 1960 he worked as a journalist first for the "De Nieuwe Zuidhollander" and later for "Het Binnenhof". Starting in 1960 he worked as a parliamentary journalist for "Unitas- en Persuniecombinatie". His work in this position lasted until 1966. Van der Sanden became politically involved in 1966 when he became parliamentary advisor and secretary to the Catholic People's