I posted on Facebook about this earlier with a cool video clip. Here are just a few photos from my camera. This was the reason we went to LA, to visit the Rain Room. It was quite interesting. It is currently at the LA County Art Museum. It's a special ticketed instillation. The room has "rain" pouring down. But there are sensors, and where ever you walk, the rain stops, or if you move your arm, so you control the weather.
It was a cool concept. You get to be in the room for 15 minutes and 8 people at a time can enter the "rain".