23. Vortograph, by Alvin Langdon Coburn. 1917. Gelatin silver print, 28.3 by 21.4 cm. (George Eastman House, Rochester NY; exh. Tate Modern, London).
Attributed works:
24. Homage to Kandinsky, by Marta Hoepffner. 1937. Gelatin silver print, 39.5 by 29.3 cm. (Estate Marta Hoepffner; Stadtmuseum Hofheim am Taunus; exh. Tate Modern, London).