Isaac Newton set out the colors of the rainbow we memorize today. However, he originally didn’t include orange or indigo. He only added them later because of his occult belief that there must be 7 separate colors, just like there are 7 notes in a musical scale and 7 days of the week.
Sir Isaac Newton had a dog called “Diamond” who knocked over a candle and set fire to twenty years worth of his research.
Isaac Newton stuck a needle in his eye, placing pressure on the eyeball, to study the human eye as a lens and how it perceives color.