Composition with Red Blue and Yellow De Stijl. An encounter with fellow Dutch artist Bart van der Leck provided ground for Mondrian to exchange ideas. From van der Leck he received the concept of painting flat areas of pure color; a solution to Mondrian’s problem of coloring - he was then using color in what he considered an Impressionist way, which was too restless and emotional. In return, van der Leck adopted Mondrian’s concept of crossed vertical and horizontal lines as a basis for composition. These two technical elements are consistent throughout all of Mondrian’s work. Shortly after the formation of Mondrian and van der Leck’s
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