SOMEWHERE OVER THE RAINBOW, bluebirds sing, and dreams come true. At the foot of the rainbow lies what—a pot of gold, a fortune, great wisdom? Some say a rainbow is a bridge between the spirit world and ours. Or perhaps the rainbow, in first incarnation, sealed a covenant between humankind and the deity. One thing is for certain. To gaze at an arch of flaming colors against a stormy sky is to be in touch with human wonderings, dreams, and longings as old as humanity itself.