How can we see colour?
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What none of the replies have yet to answer is how the experience of colour emerges from the physical process. Our brains recognizes differences in wavelengths but why do we experience it as hue rather than pitch? And why sound as pitch rather than hue?
We do not only sense a blue wavelength but we see blue as a visual effect added upon the shape of something.
And there is a significant difference between just seeing and seeing colour. Some people who are visually impaired in the brain and not the eyes, can recognize shapes but do not see any colours or fine contrasts. Some can even tell someone is smiling but have no concious imagery of it. If you ask someone with this condition what they see they will insist: “nothing”. But if you smile at them they will smile back.
I can’t answer this, to the best of my knowledge it is connected to conciousness which we don’t know a lot about how it works.
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