So the tough thing about buying a bookshelf, or any piece of furniture really, is that if you ever decide to move it to another room (or another house), there's no guarantee it will fit in its rightful place. But what if you could change the dimensions of that shelf entirely. Marica Vizzuso's B-OK takes its inspiration from a room divider, able to fold up into a compact tower or fan out into a wider looking shelf. It's not only simple, but more importantly, versatile. [Design Milk]