There are certain readers for whom books exist in the moment of reading them, and later as memories of the read pages, but who feel that the physical incarnations of books are dispensable. Borges, for instance, was one of these. Those who never visited Borges’s modest flat imagined his library to be as vast as that of Babel. In fact, Borges kept only a few hundred books, and even these he used to give away as gifts to visitors. Occasionally, a certain volume had sentimental or superstitious value for him, but by and large what mattered to him were a few recalled lines, not the material object in which he had found them. For me, it has always been otherwise.