What is art? What is its function? What is the importance of using colour? What is the meaning of using different materials? What is the relationship between art and reality? Is art information or communication? These are just some of the questions Achille Bonito Oliva directed to 65 of the greatest and most controversial artists of our time, such as Joseph Beuys, Andy Warhol, Bruce Nauman, Sol LeWitt, Robert Morris, Gilbert&George, Robert Ryman, Joseph Kosuth, Jannis Kounellis, Michelangelo Pistoletto, Hidetoshi Nagasawa, Giulio Paolini, Alighiero Boetti, Jimmy Durham, Marina Abramovi c, Mimmo Paladino, William Kentridge, and Dennis Oppenheim.