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
Nelly van Doesburg parents did not appreciate the association with Van Doesburg, who was not only Protestant, but also married. She ran away from home around the turn of the year from 1920-1921 and was received in Leiden by J.J.P. Oud and Van Doesburg's wife Lena Milius. During her relationship with Van Doesburg she was introduced to the world of modern art. Van Doesburg took her on a lecture tour through Europe in March 1921, during which they also visited Piet Mondriaan in Paris. From April 1921 she lived with Van Doesburg in Weimar. In December she spent a few weeks in Vienna