If a urinal is art, can hammering it be, too?

The porcelain urinal was slightly chipped in the hammering, which took place Wednesday during the final days of a Dada exhibition at the Pompidou Center. The artist, Pierre Pinoncelli, 77, who urinated into the same urinal and also struck it with a hammer at a show in Nîmes, France, in 1993, has a long record