The Zaj group of artists consisted of Hidalgo, Marchetti, Castillejo, and Ferrer. This catalogue includes photographs of pianos modified by Zaj for Archivo Conz. Thirty-two large scale silkscreen prints on cloth published by Conz of Zaj images are depicted. The Sackner Archive holds several of the originals which are often postcard size. -- Source of annotation: Marvin or Ruth Sackner.

Stored with Zaj material. The card depicts a regular grid of periods on a deep blue colored background. -- Source of annotation: Marvin or Ruth Sackner.