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Daffodil · 1108 days ago · link · · parent · post: If We Have No Word for a Colour, Can We See It? Researchers Say No.
At first I was also doubtful of early human "not seeing" blue, but then I started thinking about all the different shades of colors we have now. I've seen men commonly refer to pastel pink as "purple", so it isn't that far fetched to believe that if the brain hasn't taken the time to distinguish two similar things, it processes them as the same. Being able to identify blue from green would have had no real-world benefit until blue paints and dyes became available for art. Blue plants are rare and even if you came across one in the woods, your brain would still see it as "plant."