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How many distinct colours can you see?
submitted 2 years ago by jet199 from imgur.com
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[–]JasonCarswell 1 insightful - 3 fun1 insightful - 2 fun2 insightful - 2 fun2 insightful - 3 fun - 2 years ago (0 children)
https://en.wikipedia.org/wiki/Photoreceptor_cell#Humans
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[–]JasonCarswell 1 insightful - 3 fun1 insightful - 2 fun2 insightful - 2 fun2 insightful - 3 fun - (0 children)