"Herwarth Walden (actual name Georg Lewin, 16 September 1879 in Berlin – 31 October 1941 in Saratov, Russia) was a German Expressionist artist and art expert ...
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in many disciplines. He is broadly acknowledged as one of the most important discoverers and promoters of German avant-garde art in the early twentieth century (Expressionism, Futurism, Dadaism, Magic Realism)." - (en.wikipedia.org 12.08.2020)