Some pages from the catalog of the project
If I had a mind... (Ich stelle mir vor...). Concept-art. Project-art,
Verlag M. DuMont Schauberg, Köln, Germany, 1971 (Ed. by Groh, Klaus)

List of participants: Jan Van Den Abbeel; Eric Andersen; Marina Apollonio; Jared Bark; Paul Berry; Julien Blaine; Marinus Boezem; Clement Borlat; Udo Breger; Keith Brocklehurst; Stanley Brouwn; Linde Burkhardt; Alessandro Carlini; Christo; Jürgen Claus; Cordioli; Paul Cotton; Dadamaino; Bruno Demattio; Antonio Dias; Jan Dibbets; Herbert Distel; Wolfgang Ernst; Carl Fernbach-Flarsheim; Bruno Gambone; Jochen Gerz; François Guinochet; Alfred Gulden; Axel Heibel; Eva Hesse; Klaus Hoffmann; Hans-Werner Kalkmann; Robert Klemmer; Hans Koetsier; Joseph Kosuth; Jannis Kounellis; Edward Krasiński; Peter Kuttner; Christian Lindow; Alain Arias-Misson; MOC (Karl-Heinz Thyssen); Tony Morgan; Maurizio Nannucci; Peter Nemetschek; Paolo Patelli; Günter Saree; Konrad Balder Schäuffelen; Paolo Scheggi; Jean Frédéric Schnyder; Schuldt; HA Schult; Robert Smithson; William Louis Sørensen; Klaus Staeck; Petr Štembera; Trans-Parents-Teachers Incl.; Dieter Tangen; Timm Ulrichs; Janos Urban; Mark Verstockt; Frank Lincoln Viner; Peter Vogel; Stephen Willats; Eric Van Zeylen; Peter Zweifel.