Imagine a full, half or quarter wall size of e-paper that dynamically display all of your ebooks collection as if they are physical copies in your study room, main hall, etc.

The main different compared to the physical bookshelf is that it is always updating (round-robin, moving, rotating, etc) thus it can display all your books in a limited e-paper physical gallery space (depending on the installed e-paper size and dimension) but should cover all your ebooks over time.