At first, the library of the Warburg Institute, in London, seems and smells like any other university library: four floors of fluorescent lights and steel shelves, with the damp, weedy aroma of aging books everywhere, and sudden apparitions of graduate students wearing that look, at once brightly keen and infinitely discouraged, eternally shared by graduate students, whether the old kind, with suède elbow patches, or the new kind, with many piercings.
Only as the visitor begins to study the collections does the oddity of the place appear. In the range-finder plates mounted on the shelves, where in a normal library one would expect to see “Spanish Literature, Sixteenth Century” or “Biography, American: E663-664,” there are, instead, signs pointing toward “Magic Mirrors” and “Amulets” and “The Evil Eye.” Long shelves of…