Medium: color pochoir. Printed in Paris for the Temoignages pour l'art abstrait project (Witnesses for Abstract Art), published in 1952 by Editions d'Art d'Aujourd'hui, in an edition of 1500. The sheet size, including margins: 9 3/8 x 7 3/4 inches (240 x 195mm). A richly inked impression on wove paper, and now quite rare. Not signed (the artist's name is printed in text beneath the image).

Medium: serigraph / silkscreen. Printed in 1964 on thin wove paper by Imprimerie Mazarine and published in Paris by Galerie Denise Rene for the rare exhibition catalogue "Hard Edge". This work was attached by the publisher onto a larger support sheet. Richard Mortensen was one of several artists who contributed silkscreens for this project (after their own paintings). Image size: 7 x 7 inches (190 x 190mm). Not signed.