When he shone sunlight through a prism, it split into the colors of the rainbow. Before Newton's discovery, people didn't realize that white light contained so many colors of the visible spectrum.

“It has no justification in experiment exactly; it just represents something that he’s imposing upon the color spectrum by analogy with music.” Of his rainbow experiment Newton wrote that he had ...

Through his daydream, he learns that rainbows are formed when sunlight passes through raindrops, acting like prisms that create a spectrum ... sunlight, prism, colors, daydream, weather science ...