A few years ago, Becky and I picked up a pendulum on the Turquoise Trail in New Mexico. It swirls about in a very fine sand, leaving behind nice square patterns. I put my desk lamp almost flat with the plane of the sands, creating big shadows, and squeezed off a few shots.

I shot this with my Canon 7D and 24-105/4L, and processed the image with Photoshop CS4E, along with a little black and white conversion through Nik Color Efex Pro.