Freiburg: No Sign de Sign, 1979. First Edition. Square spiral-bound quarto. Number 273 of 300 numbered copies. Artists' book, featuring tipped-in reproductions of a grid of four Polaroids on alternating pages, each overlaid with a page of irregular die-cut openings that reveal portions of the photographs beneath. Text in German. A photocopied letter introducing the book has been laid in. Lightly bumped at the head of the spine, else near fine in plain spiral-bound wrappers, with cutouts and an acetate overlay on the front cover.