He referred to "largely unconscious, spontaneous expressions of inner character" as "Improvisations", which he contrasted with his (*)  "Impressions" and "Compositions".
This man proclaimed that "modern art can only be born when signs become symbols" in his analysis of the geometrical aspects of paintings. In 1924, this artist exhibited across the United States as part of a four-person tour that also included Lyonel Feininger and Alexej von Jawlensky  (yiv-LEN-ski) . He referred to "largely unconscious, spontaneous expressions of inner character" as "Improvisations", which he contrasted with his (*)  "Impressions" and "Compositions". This author of  Point and Line to Plane  and Concerning the Spiritual in Art  depicted a white horse racing across a landscape in a painting that inspired Gabriele Münter, Franz Marc, and others. For 10 points, name this Russian-born artist whose painting of a man on horseback was the namesake of  The Blue Rider  group.
This man proclaimed that "modern art can only be born when signs become symbols" in his analysis of the geometrical aspects of paintings.
Wassily (Wassilyevich)  Kandinsky