Thanks to his penchant for collecting, Poole already had the basic materials. To start, he rewired a tiny green laser—the kind used in a pointer—so it could work with a longer-running battery pack he had lying around, which he had pulled out of an electric bicycle. Next he nailed an electronics-mounting frame to a three-foot-long wooden board and set the laser at one end, aimed down the frame. He snapped in a lens from a used disposable camera at the other end and set a makeshift slide holder and the scrapped slide viewer's lens in between. The viewer enlarges the beam so it covers the slide, and the camera's lens lets him adjust the focus.