Rainbows are one of Mother Nature's amazingly beautiful wonders that are created naturally by combining light and water in the air. It might sound simple, but the view of the rainbow and understanding the fact that you see a reflection of the sunlight in the small droplets of water carried by air and it all combines in a giant colorful arc that stretches across the sky are definitely a sight to see. And how rainbows work was first explained in the early fourteenth century. Sunlight gets bent when it passes thru droplets of water, and that bending creates a colorful arc that we call a beautiful rainbow. A nature custom progress bar for YouTube with Warm Rainbow.