In the “Modern Art Exhibition” which was held in Amsterdam in October
under the shadow of Cubism, his works still showed his own unique personality. It could be said that he was the real developer of cubism, rather than the imitator. For example, he insisted on the completely positive form to show the theme and he also simplified the natural form of the objects until the pure essence was reached. Apollinaire had made this assessment for him, “Although Mondrian is strongly influenced by Picasso, Mondrian’s personality is completely owned by himself”.