Together, "Common Ground: Ceramics in Southern California, 1945-1975" at the American Museum of Ceramic Art in Pomona and "Clay's Tectonic Shift: John Mason, Ken Price and Peter Voulkos, 1956-1968" at Scripps College's Ruth Chandler Williamson Gallery in nearby Claremont made for the most thorough telling of the tale of a distinctive revolution in postwar art. One laid out the rich panoply of modern ceramic conventions, the other cheerfully smashed them.