It has not been happening forever, this apparent cycling of the sun, around the earth - only about 4.5 billion years. Light vanishing as the sun is rotated away and behind the horizon. Pigeons silently retiring from dropping white bombs on the objects below. Forms recede into black night, colour fades into invisibility; stars blink into awareness as the scattered light in the atmosphere recedes. And the night people, grasping at and fleeing from their dark dreams scurry into the dark below.