lithography 20/60, Arches - hand-made paper (later edition; original drawings from the beginning of 1930s), 41 x 41 cm, sign. "Kupka" in the print
Lit.: Christie´s, Collection de Madame Darthea Speyer, Paris, 2010 (auction cat.);
The Solomon R. Guggenheim Museum, František Kupka 1871-1957, New York, 1975 (exhibition cat.), p. 297.