Wolfgang Paalen, Discovery of Infra-Space II, 1941, Conté crayon on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37488

Wolfgang Paalen, Fumage, 1944–45?, Oil and candle soot on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33314

František Kupka, Replica of Fugue in Two Colors: Amorpha, 1912, (1946), Gouache, ink, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34761

František Kupka, Replica (1946) of Vertical Planes, (1946), Watercolor, gouache, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34788