Yeah, that's another giant can of worms. Light with a wavelength of 600nm is orange, but there is a combination of red and yellow light that is indistinguishabl

Yeah, that's another giant can of worms. Light with a wavelength of 600nm is orange, but there is a combination of red and yellow light that is indistinguishable from 600nm light to us. Worse, there is an infinite number of combinations of two or more different wavelengths that look indistinguishable from 600nm light to us. Yet any other species would disagree that they look the same. Or a human with slightly shifted sensitivity spectrums of their rods or cones. One the one hand it's great because it makes full-color print and screens so easy. On the other hand there is so much information in light that is simplified away by our eyes