Travelers walking through the underpass between terminals at O’Hare Airport in Chicago are treated to an overhead and side wall light show. The hurrying passengers provide a continuously changing image for photography, so no two shots will be identical. (But if you wait for the perfect shot and don’t pay attention to the time, you could miss your plane.) This photo was taken with a Nikon D200 and a Nikkor 18-200 mm VR lens at 18 mm. The exposure was f/8 and 1/8 sec.