File:Marc Chagall, 1911, Trois heures et demie (Le poète), Half-Past Three (The Poet), oil on canvas, 195.9 x 144.8 cm, Philadelphia Museum of Art.jpg

Published in 1917
[https://archive.org/stream/einblickin00wald#page/60/mode/2up Herwarth Walden, Einblick in Kunst, Expressionismus, Futurismus, Kubismus, Published 1917 by Verlag Der Sturm in Berlin. Written in German, Page 61]

See here too.