Hyogo Prefectural Museum of Art's present draw card is the Saint Petersburg collection, "Old Masters from the State Hermitage Museum." But on a lower level, at the far end of a long corridor gallery, are photos and grainy videos — the small-scale documentation of one of Japan's little-known postwar happening/public-performance avant-garde groups — 0 (Group Zero). Group Zero is comparable in scope and activity, if not in longevity, to The Play, another avant-garde group that also began in Kobe a few years earlier.