In this book which is also designated as Tangenten No.4, a small square of mirror is set in stamped out thin card pages. One glassine page overlays it with a printed magic square poem. Parts of the backing of the mirror have been scatched out by the artist and it has been glued down to the card. Poetry has been printed on the pages with the stamped out sections. This book was edited by Walter Aue. -- Source of annotation: Marvin or Ruth Sackner.