I was watching a multi-colored loading icon, and it piqued my interest.
Red, orange, yellow, green, blue, indigo, violet.
(Is indigo a real color? I don't know, but that's what I was told growing up)
Is there a specific reason for the wavelengths associated with these colors? Yellow is a color, and green is a color, and what's in between seems to be yellow-green or whatever name you want to call it. But why isn't that color that lies between yellow and green what we choose to identify? Or for any pair of adjoined colors--why are red and orange distinct colors, instead of red-orange and orange-yellow?
Is it arbitrary that we chose these spots on the spectrum to identify as red, orange, yellow, and green? Or is there a scientific reason we chose these wavelengths?
I have a basic understanding of the electromagnetic spectrum and visible light, but nothing more. My apologies if I made incorrect assumptions or did not word things correctly.