When he needed an idea, Thomas Edison liked to sit in a "thinking chair" holding a metal ball bearing in each palm, with his hands closed. On the floor, directly under his hands, were two metal pie pans. Edison would close his eyes and allow his body to relax. Somewhere between consciousness and dreaming his hands would relax and open without effort, letting the ball bearing fall noisily into the pie pans. That's when he would wake up and write down the idea in his head at the moment.