 Richard Müller-Freienfels was another important early theorist.Numerous artists in the twentieth century began to be influenced by the psychological argument, including Naum Gabo, Paul Klee, Wassily Kandinsky, and somewhat Josef Albers and György Kepes.The French adventurer and film theorist André Malraux was also interested in the topic and wrote the book La Psychologie de l'Art (1947-9) later revised and republished as "The Voices of Silence".