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ELI5: How was the first colour system invented? Like how did humanity decide the world 'red' correspond to the colour? And was it before or after we learnt about photons?
ELI5: How was the first colour system invented? Like how did humanity decide the world 'red' correspond to the colour? And was it before or after we learnt about photons? * /r/explainlikeimfive
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