“There is much we can learn from the 12th Havana Biennial — a performed, dematerialized show — about what art can be, where it can exist and who it is for. From Tania Bruguera’s performance, we are learning what art can do — risky, truth-revealing things — for artist and audience alike. It may well be that her performance, end not in sight, is the one for which this biennial will be remembered.”