Between the end of the 1950s and the 1960s he joined the Nouveau Réalism group, created by Pierre Restany, and concentrated on his art characterized by Accumulations (assemblies of everyday objects, often sectioned and shattered), Poubelles (accumulations of rubbish), Inclusions (cast accumulations of objects in plexiglass), Combustions (burnt objects) and Colère (monuments cast in concrete). Very often the objects used were musical instruments, which also inspired most of his goldsmith creations, but also tubes of paint, brushes, shoes, coins, watches, and everyday objects.