Dutch painter and art theoretician (1872-1944) who is regarded as one of the greatest artists of the 20th century. He is known for being one of the pioneers of 20th-century abstract art, for his association with the De Stijl movement, and for his primary-colored geometric 'Compositions.' ALS signed “P. Mondrian,” one page both sides, 5.25 x 7, March 2, 1926. Handwritten letter to fellow artist Felix del Marle, director of the art journal Vouloir, in part (translated): “Yesterday I had finished my article which I wrote after your departure, inspired by what we had discussed and especially by what you and Madame had told me about my studio.” He asks for his French to be corrected, if necessary (“It doesn't have to be beautiful French (on the contrary!) but it has to be correct”), and forwards two photographs, explaining that one has not been published: “It seems to me that it will be very good if you could make a plate on linoleum or wood; I have seen you do them. Such a large plate on zinc will also become too expensive and less beautiful.” He concludes: “'I'll be interested in what you say about my article; I believe it can be useful for the movement.” In fine condition.