Eighteen letters of the alphabet were printed in couplets on facing pages of this book. Castillejo belonged to the Zaj group, a movement in Spain with the style of Fluxus. -- Source of annotation: Marvin or Ruth Sackner.

The book consists of the printed letter "i" - one centered on most of each page, with some pages being blank. Castillejo belonged to the Zaj group, a movement in Spain with the philosophy of Fluxus. -- Source of annotation: Marvin or Ruth Sackner.