Composition with Red Blue and Yellow working relationship, they were contacted by Theo van Doesburg, a painter who frequently wrote about art for different periodicals and whom is considered the propagandist of the De Stijl movement. He invited Mondrian and van der Leck to join his initiative to start an artistic review periodical. They agreed and the result of this was the journal entitled De Stijl. Together they formed an artistic collective that consisted not only of painters but also architects; the movement was confined to strictly Dutch areas due to war. These artists cannot be considered the same. For example, not all De Stijl artists
Bart van der Leck disagreements with Mondrian his abstract style became based on representational images. His painting Tryptich is an example, in which he transformed sketches of a mine in Spain into seemingly abstract shapes. In 1919-1920 he created the interior design for , in the Hoge Veluwe estate. The hunting lodge was designed by Hendrik Petrus Berlage. In 1930, he was commissioned by Jo de Leeuw, owner of the prestigious Dutch department store Metz & Co. to design interiors, window packaging, branding and advertising. For these print materials van der Leck developed a rectilinear, geometrically constructed alphabet. In 1941, he designed a typeface