Also ... when you're more oxygenated, you're in better shape.

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For a hundred years, we've thought that color vision was for finding the right fruit to eat when it was ripe.

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Company logos, for example, are meant to be recognized, and we found that logos have a high correlation. Shorthand systems, which are meant to give a note-taker speed at the expense of a commonly recognizable system of symbols, do not.

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Evolution has shaped our visual system to be good at seeing the structures we commonly encounter in nature, and culture has apparently selected our writing systems and visual signs to have these same shapes.

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This seems like a bad idea to have two cones so close together. But it turns out that the closeness of the M and L cone sensitivities allows for an additional dimension of sensitivity to spectral modulation. Also, their spacing maximizes sensitivity for discriminating variations in blood oxygen saturation.

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Also, ecologically, when you're more oxygenated, you're in better shape.

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