3 O'clock in the morning brought the moon into perfect position to illuminate the canyon as well as this graphic message from the distant past. Because the required wide open f/2.8 aperture caused a shallow depth of field, I had to use focus stacking techniques to get front to back sharpness. Starting at the nose of the animal, I gradually focused farther and farther into the scene with each successive shot. Ultimately, I ended up with ten frames which I manually merged in Photoshop, using only the in-focus areas of each frame. The cactus was lit by my LED headlamp passing through an orange filter for effect. I chose to make the rock wall nearly half of the frame in order to place emphasis on the petroglyph and the ancient people who created it.