A year later, when the Germans had lost the war and the concentration camps were liberated, the Allies photographed and filmed the camps, the survivors, and the traces that pointed to the millions murdered. It was above all the images of piles of shoes, glasses, false teeth, the mountains of shorn hair that have made such a profound impression. Perhaps we need images, so that something that is hardly imaginable can register: photographic images as the impressions of the actual at a distance.