Our colour vision developed a long time ago to enable our ancestors to identify the newer shoots. Two books, "The Making of the Fittest", By Sean B Carroll and Neil Shubin's "Your Inner Fish", both of which I read with much interest last year, make this point.
My next photo is showing an exerpt from the former, which interest me as one of the 8% mentioned, having difficulty with reds and greens, but not always. However, I'd probably fail on a navigation test!
