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
De Stijl connections in the art world. Around 1915, Van Doesburg started meeting the artists who would eventually become the founders of the journal. He first met Piet Mondrian at an exhibition in Stedelijk Museum Amsterdam. Mondrian, who had moved to Paris in 1912 (and there, changed his name from "Mondriaan"), had been visiting the Netherlands when war broke out. He could not return to Paris, and was staying in the artists' community of Laren, where he met Bart van der Leck and regularly saw M. H. J. Schoenmaekers. In 1915, Schoenmaekers published "Het nieuwe wereldbeeld" ("The New Image of the World"),