“Okay. Action!” Her voice rang out from the projection room. The show began. Light projected onto the screen. But there was nothing there but a blank space, a rectangle of white light illuminating the screen. I had chosen nothing. As I gazed at the blank screen, I remembered a photograph I once saw. It was a picture of the inside of a movie theater. The photo was taken from the projection room and showed the seats and the screen. The photograph had captured one entire film and was taken by opening the shutter at the beginning of the film and then not closing it again until the film ended. In
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