npub14w37fjdpkezfacsz3q8r97yqs9e0cquntlfkamgdhewnpaud4x9qtu9vjx (npub14w3…9vjx) well, they're sorted by frequency, like in a rainbow.
https://en.wikipedia.org/wiki/Rainbow#Number_of_colours_in_a_spectrum_or_a_rainbow
I mean, this is a natural ORDERING of color values, one way or another. And they're all about equally spaced on the spectrum.