It's casual Friday, and time to check out a simple yet stylish way to store and display your hard covers.  The Conceal Bookshelf by Miron Lior of Umbra gives the illusion of a stack of books defying gravity as they are piled against a wall.  You could use it as an art piece, or for more practical reasons; keeping your table tops and work-spaces clear.  Another similarly interesting piece of hardware is the Conceal Towel Shelf.