With his characteristic compositions of rectangles and black lines, Piet Mondrian (1872–1944) is regarded as one of the founders of abstract painting. He is considered to be a master of the composition of coloured areas. Through his method of strict reduction to the basic elements of painting, Mondrian created icons of classic modernism. A lesser-known fact, however, is that Mondrian started out by creating paintings in the impressionist style of the Hague School and explored different styles of art before lines and the organisation of image areas dominated his artistic creations. A new exhibition developed by the Gemeentemuseum Den Haag in cooperation with the Martin-Gropius-Bau now endeavours to illustrate this development in Mondrian’s works.