Concrete patch in the brick sidewalk next to the Menlo Park Caltrain station. They almost pulled it off, but the footprints give away the game.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 44mm, ISO 400, f/5.6, shutter 1/250 sec. Exposure, contrast, saturation, levels, and highlights adjustments in Aperture.