This book documents Claus' language drawings from 1959-1989 in the first section. It includes texts by Claus and others such as Gerhard Wolf, the owner of the Janus Press, and Dieter Mahlow. Claus also writes about his involvement with Kaballa and Communism. He quotes Gershom Scholem from his book on Judaica 1963. Several of his drawings of this period incorporated Hebrew texts. The next section deals with the text of "Aggregat K." This work was first published in 1987 in 50 copies and is reproduced in an accompanying volume in 1500 copies. The text includes a letter from Claus to Nela and Alain Arias-Misson, a critical essay by Gerhard Wolf, Claus' notes on the project, and correspondence between Claus and Wolf. The third section deals with the background of "Versuchsgebiet K" and includes comments by Wolf. -- Source of annotation: Marvin or Ruth Sackner.