This exhibition which caused a great deal of commentary was one of the first manifestations of arte povera, conceptual art and land art in Europe and as such marked an artistic breakthrough for many of the participants. Among the artists are Carl Andre, Giovanni Anselmo, Ben d'Armagnac, Joseph Beuys, Walter de Maria, Jan Dibbets, Barry Flanagan, Jannis Kounellis, Richard Long, Mario Merz, Bob Morris, Bruce Nauman, Dennis Oppenheim, Panamarenko, Rob Ryman, Lawrence Weiner, & Gilberto Zorio.