It's no surprise that a dude who lives in a city of 18 million people would appreciate the need to conserve space. Shanghai-based artist Danny Kuo created the StairCASE, a bookcase where the shelves slide out to become a stairwell. We've seen the amalgamation of shelves and stairs before in London, but StairCASE can be put just about anywhere. The design lets you have a much taller bookshelf (most top out at roughly six feet to accommodate human height), or functions as a way to reach a lofted area for sleeping or storage. I could've used something like this in New York. [Danny Kuo via Craziest Gadgets]