In 1921 he had fifty works on view at the Kronprinzenpalais (Nationalgalerie) in Berlin, which were praised by critics and established his reputation as the leading Expressionist.

• 他多年来追求的目标是自由，这既包含从学院规则中解脱出来的艺术自由，也包含从专制暴力下解脱出来的人的自由。