Portfolio of 10 color silkscreens - Printed by Siebdrucktechnik, Essen. - Individual prints were issued in different edition sizes (90; 125; 185; 270) - Published by Edition Merian, Krefeld. Literature: - Galerie Rottluff (ed.): Otto Piene - Werkverzeichnis der Druckgrafik 1960-76, Karlsruhe 1977, cat. rais. no. 149-158.
