The library … is no mere cabinet of curiosities; it’s a world, complete and completable, and it is filled with secrets. Like a world, it has its changes and its seasons, which belie the permanence that ordered ranks of books imply. Tugged by the gravity of readers’ desires, books flow in and out of the library like the tides. The people who shelve the books in [Harvard’s] Widener talk about the library’s breathing — at the start of the term, the stacks exhale books in great swirling clouds; at the end of term, the library inhales, and the books fly back.
