I just got back from 5 days at California Photographic Workshops. I am one of the directors of this school, put on once a year for professional and aspiring photographers. This was at Mission Springs in Scott’s Valley, near Santa Cruz, CA. One evening, we brought models to the beach. In between helping various students, I decided to try an experiment with my iPhone. I ran alongside the model, trying to keep her in the frame while holding the camera straight, my fingers off the lens, and frantically stabbing a virtual shutter button that I could not see in the bright sunlight. When I looked at the result, I was astonished to see that somehow the movement cause a warping of the horizon line. Unexpected, and that is exactly why I like to do experiments!