"The British photographer's recent book, "Guantánamo: If the Lights Go Out," includes images from both the guards' and the prisoners' quarters at the infamous Cuban detention center, as well as pictures of the homes of released detainees. Here, reduced to twelve photographs and one video, Clark's deadpan documentary project, in which no people are pictured, loses much of its coherence but retains a good deal of its power. Big color photographs of a force-feeding chair, an isolation unit, and shackles at the ready can only hint at conditions on the base. But a display of censored letters to one prisoner makes the level of intimidation and control frighteningly clear. Through Jan. 12."

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