The funny thing is that colorblind people are more attuned to subtle
differences in shade. It's precisely the reason that the principle
behind military camouflage is a mystery to colorblind kids (they can't
figure out why everyone says it makes people hard to see when it does no
such thing). So if you want someone who can spot the difference between
two slightly different shades of the same color, then you want a
colorblind person. If you want to detect actual shifts in color, then
you don't want a colorblind person.
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