“It’s interesting, isn’t it, that in twenty-five years of curating shows, I can’t recall a single artist mentioning Greenberg, let alone taking his ideas seriously.” This remark––made by the chief curator of a major U.S. museum of contemporary art during a coffee break at the “Clement Greenberg at 100: Looking Back to Modern Art” symposium––helped me gain some perspective on the event. So did the introduction by the organizers, Miguel de Baca and Prudence Peiffer,...