I've got to admit I think the Invisible Bookshelf ($10, reduced from $15) is one of the most clever inventions I've seen all year. But I'm really also digging its nearly invisible price tag! Although it looks like a magical illusion, there's actually nothing tricky to the bookshelf. You simply secure your largest book into the bracket, and then that bottom becomes the shelf itself. Bookcases are so last season, aren't they?