Within the depths of the Library, at the end of the infinite shelves, lies a single book. While approaching this area there is a persistent scratching sound. This is the sound of hundred of trillions of books writing themselves, the thanobiographies of every individual who has ever lived, the life story of a person as it happens. The book at the center is illuminated by a single shaft of light, and seems to be constantly expanding. All along the lower edges of the podium upon which it stands are other books, each expanding at a constant rate. This podium is the repository of the Thanobiographies of the highest-ranking devils and Seraphim, with the spot of honor occupied by the Thanobiography of the Library itself, a book that contains within it the secrets of the infinite shelves. Only the Librarian is permitted to enter this place, along with his apprentice when his final visit arrives.