The colors of the rainbow always show up in the same order: red, orange, yellow, green, blue, indigo and violet. It's organized by wavelength. Red, with the longest wavelength, is on the outside ...

“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 ...

so he adopted eight colors for the stripes, each with its own meaning: hot pink for sex, red for life, orange for healing, yellow for sunlight, green for nature, turquoise for art, indigo for harmony, ...