Now a personal library is something that resides on a computer server somewhere, accessed through your Amazon account. You can sell your house and traipse across the country or overseas, but all that changes is the IP address from which you access your “library.” The books do not become dog-eared, they are never misfiled. A guest in your home will no longer note that Gibbon or Boswell lies next to your easy chair. If someone wants to know who you are through your books, the place to look is GoodReads and LibraryThing. The printed book is aware of the passage of time.