Your tripod is a light source

I know it sounds a bit funny, but it's brilliant. David Hobby A.K.A. Strobist was featured on the latest Lightsource podcast. He was saying that he uses a tripod when he needs to light a very large space, so he locks the camera down and uses shutter speed to raise the ambient light. This is not a new concept, but the way David equates the tripod with a large light source is great.