Cold air rises from the ground as the sun goes down. The eye-burning clarity of the light intensifies. The southern rim of the sky glows to a deeper blue, to pale violet, to purple, then thins to grey. Slowly the wind falls, and the still air begins to freeze. The solid eastern ridge is black; it has a bloom on it like the dust on the skin of a grape. The west flares briefly. The long, cold amber of the afterglow casts clear black lunar shadows. There is an animal mystery in the light that sets upon the fields like a frozen muscle that will flex and wake at sunrise.