"Footprint of a Cloud:" After the rains pass, sometimes all they leave behind are puddles in the rocks. In this case, an almost shoe-shaped depression collects the water and reflects the transient clouds as they make their way across the sky. Taken in Prescott, Arizona. Nikon D810, Nikkor 24-70 @ 27 mm, f/20, 1.6 seconds, ISO 64, Manfrotto tripod.