This is a 3D Book from 1733. Though this detail is not included in the model, the original has the center of the pages carved out to form a secret compartment that could easily allow you to hide an item amongst a shelf full of books. You occaisonally see this in old books, especially from the early 1800s. This is the oldest one I know of. Although it is not availible now for download, I plan to allow downloading soon.
Thank you,
Cheerwine
P.S. I have many more models for sale at my CGtrader store. There I am under the same name.