After messing around with feeding the individual colored lights through other prisms, he came to the conclusion that white sunlight isn't really white at all, but a combination of all the individual colors. So, in a darkened room, Newton let a tiny bit of sunlight through a chink in a curtain, making the light diffract through a prism. Newton wanted to figure out where color actually comes from - he knew feeding white light through a prism would make the rainbow color pattern we all know and love on the opposite wall: red, orange, yellow, green, blue, indigo, violet (ROYGBIV, for short). You've seen the color wheel before: It's just a circle that looks like somebody took the rainbow and attached the red end to the violet end, which is basically what Isaac Newton did when he created the first color wheel in 1666.
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