"At the University of Pittsburgh Medical Center's golf fitness lab, this man had his swing turned into a 3-D model so computers and scientists would be able to study it. They use ping-pong-ball-sized sensors to gather data, but I wanted to keep the area dark, and the sensors would not show up well with a camera-mounted flash. Instead, I put tiny strobe lights on him, and they went off as I snapped the shutter. Pretty cool.