Whether we go back again and again to a classic or pick up an old favorite to see how it has fared or dig deep into the treasures of our youth, rereading is an experiment that is bound to change us, and to change our impressions of the books we read. Rereading can certainly surprise, it can instruct, and it can make us feel safe. Maybe it is not indulgent to reread a book, but a way to learn; and what is any sort of reading but a way to learn, whether it is something new about the world or just something new about ourselves?