The country [ Brittany ] is very beautiful and painterly one see stimulating color tones; but the more abstract one works, the more one transforms the sketch into combinations. (translation from German, Fons Heijnsbroek, 2018)
note on a postcard to Herwarth Walden [initiator of Der 'Sturm' in Germany], 14 May 1914; as cited by Arend H. Huussen Jr. in Jacoba van Heemskerck, kunstenares van het Expressionisme, Haags Gemeentemuseum The Hague, 1982, p. 18