Author: Texts by Klaus Heinrich,  Horst Kurnitzky, Jens Beiderwieden,  Jürgen Harten,  Joseph Beuys,  Harald Szeemann,  Raffael Rheinsberg,  Stephen Willats, Dieter Hacker, Heinrich Dilly,  Janos Frecot,  Peter Iden,  Rudolph Ganz,  Jeannot Simmen,  Giulio Carlo Argan