Each internal page of the leaflet has a single, hand painted, artist stamp collaged onto it. The work was done concurrent to an exhibition "Lettrisme & Hypergraphie" held at the Galerie Stadler in 1964; the Sackner Archive holds the ordinary and deluxe edition of this catalogue. According to Frederic Acquaviva, all of the drawings were done by Jacques Spacagna including the forging of signatures. -- Source of annotation: Marvin or Ruth Sackner.