A company has designed a bizarre and truly neat way to put a pool into your cramped backyard by creating a patio surface that sinks as water fills in the space. After the floor drops, you have a pool suitable for just about any use, save swimming laps, maybe. It's a great way to use a single space for more than one purpose, which might be priceless to some. On top of all that, it would make for a fantastic party trick, or prank, depending on your inclinations.
[video:http://www.youtube.com/watch?v=q7mXLqIJXHs width:640 height:390]