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From

From [here](https://www.scientificminds.com/blog/whatever-happened-to-roy-g-biv-kathy-reeves-115.aspx)

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[–] • 0 pt

Jokes aside I've always wondered why indigo is included.

[–] • 0 pt

we are just used to colors and their names, we could shift every hue 5 degrees and have the exact same concepts meaning a whole different set of colors. the 7 color one shifts the blue towards green a bit, and then puts a "more blue" color called "indigo" before purple.

Colors with names are just social constructs, they didn't do something like "the log of the frequency increases blah blah blah", we just picked colors from things we know: sky, blood, plants, etc.

[–] • 1 pt

maybe indigo originated as an attempt to distinguish sky blue from deep blue

[–] • 1 pt

That would make sense, ocean or blueberries vs sky

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No pink?

[–] • 1 pt

pink isn't on a single wavelength, its our eyes/brain combining multiple wavelengths (red and purple) into a perceived color.

The 3 primary colors likely have to do more with the 3 types of cones in our eyes for perceiving color rather than some conspiracy that only works if you arrange the colors on a wheel.

[–] • 0 pt

I need to go find a (probably) very retired teacher and ask her why the hell she taught us wrong....if she is still alive, that was about 40 years ago.

[–] • 1 pt

How our brains interpret color and the physical color based on wavelength are two different things, but both matter.

For example, brown isnt a real color either, brown is dark orange perceived as its own color. There is no bright brown, a light cannot emit brown light, it only exists in our heads.