Teton sunsets are spectacular. Occasionally, in the late afternoon during our visit last fall, gray, turbulent clouds would bring short-lived rain showers. The moisture laden air that rose and formed clouds over the tops of the Tetons would spill over the peaks and, in slow motion, begin a silent, tumbling avalanche of fog down the mountain side. Occasional breaks in the clouds provided opportunities for the late afternoon sun to break through and, for fleeting moments, sublime crepuscular rays would light up the valley floor as if they were diffuse stage lights. Continually pushed by strong wind currents aloft, the cloud clusters would inevitably reform, and the magical rays of light would fade and then vanish only to reappear moments later through a new break in the gray clouds. Then, as if a giant stage spotlight was turned on, the valley floor was once again momentarily illuminated with directed beams of light.