Captain Obvious would like to chime in: (sorry 😅)

Every color that we see is created by different types of receptors being stimulated together. A linear combination of three of these types. Arguably there isn’t really a wavelength that only stimulates one type of receptor exclusively as their absorbtion areas overlap - so it isn’t even that precise to call one receptor the “green” receptor as it sees a continuum of wavelength (of which a lot are also detected by the (so-called) “red” receptor.

It’s a little egg-and-hen-problem with the naming here.a way out of it would be to only speak about spectra if it’s in the physical realm and color of its in the percetral realm.

Don’t use brave.

And: I don’t know if Otto is really that great. It’s just a marketplace where people sell cheap stuff imported from china. I just ordered a mirror that I have to send back, because it’s not even (as in flat).

How big are your hands???