I really loved this image. The songbird was "painted" late in the afternoon after "the canvas" had already been traversed by a bicycle. I took the photo anyway, and with some care I was later able to photoshop-away much of the tire treads. You can still discern the path taken by the bicycle: mostly verticle, slightly to the left of center.
In the center you can see one of our tiny zen artists: a Thai Bubble Crab. They are about 2-3mm in diameter. They make the balls as they feed off of the algea attached to individual grains of sand. When the ball (or sand bubble) gets too big to sit on, they roll it to one side and start over again... creating the most fantastic sandpaintings as they lunch away the day.
