A rainbow is the product of physics working for your appreciation of beauty. When the Sun is behind you and a mist of water ahead, light first enters the droplets, is refracted—bent by passing through the water—and then reflected off the back of the droplet like a mirror. Before meeting your eyes, the light is again refracted as it escapes from the oxygen and hydrogen sphere. With light hitting the droplets in front of you at different distances, each curtain of droplets projects a differently colored disk of light towards you. Slightly offset, only at the edges of these disks can you see their differences in refracted light—the colors and shape of the rainbow. (The stacking of offset “disks” of light is also why the inside of a rainbow is usually brighter than the outside. Where the light disks stack up, they recombine into white light, making the inside brighter.)