Cool idea. I was living near DC when that exhibit opened, and I got all caught up in it myself. Not sure I ever really understood how he fired off all three shots quickly enough for that to work. At the time, the images with moving water made me think that he had some method whereby he passed a single holder through the camera back almost in one motion. I suppose the curators have a very good idea of the exact method. It's a shame other photographers didn't try the same thing elsewhere.