The 'Conceal Book Shelf' by Umbra makes your wall into a no-gravity zone. This item would be especially appealing to a book-lover who wants to show off just how cool their library collection actually is.
This bookshelf can hold up to 15 pounds of literature which means one can stack quite a few books without the shelf collapsing. All one must do to install the shelf in screw the piece onto the wall. Once it's stuck on the wall, one simply slides the back cover of the book under the protruding plastic piece giving the illusion that the book is stuck in the air. After that one can keep stacking books on top to create an entire tower of magic.