The last rays of a setting sun brush the top of a distant rock formation on the floor of the Grand Canyon, leaving everything else in the grasp of twilight – that time of day when the sun has slipped below the horizon, bathing the canyon in the subtle, indirect light caused by the refraction and scattering of the sun’s rays from the atmosphere. The colors of twilight are muted, and in the case of the Grand Canyon, spectacular in their own right. Pink, mauve, brown, and a hint of khaki drape the towering rock formations on the canyon floor in a mantle of delicate shades. Colors such as these make viewing the Grand Canyon just after sunset a memorable experience. I anchor the image with a huge formation just below me, which echoes the shape of the towers that soar beyond it. I removed the sky from my frame entirely – it was cloudless and clear, and pulled the eye right out of the scene. (Compare the colors of this twilight image to those of a dawn image of the canyon at http://www.pbase.com/image/83717341.)