This is Portfolio with 9 Offset Lithographs Hand Signed and Dated by the artist "Richter, 1969" in pencil at the lower right margins.
It is Hand Numbered in pencil “51/80” on the lower left margin.
The Portfolio includes the outer folder with title page and justification page.
It was co-published by Galerie Heiner Friedrich and Verlag G. v. Pape, Munich in 1969 in a limited edition of 80 copies with a few artist’s proofs.
It was printed by Hoppe & Werry, Mulheim an der Ruhr.

Note: In this portfolio Richter produced very elaborate optical illusions. He constructed the nine three-dimensional objects himself and photographed them in everyday environments.
Then he had the photographs professionally retouched so that the constructions appeared spatially impossible. He then re-photographed the reworked images and printed them using offset technique.

Condition: Excellent condition.