As if floating in mid... wall?
My friend Heather recently installed a bookshelf in her library that is (and I'll try not to oversell this) THE COOLEST BOOKSHELF IN THE MULTIVERSE (okay, I might have watched too much Fringe this weekend). The Container Store sells them and I NEED! Don't you? It's called The Conceal Bookshelf by Umbra. I'll be ordering a few... Trust!