Look at the three circles above. If all you see are three circles filled with dots of the same color, you are normal. If you see something different (such as different colored letters inside each circle) you may be a tetrachromat: very rare and super human.
A tetrachromat is sort of like being a super taster of color vision. To date, only two or three people have been identified as potential tetrachromats. You might be one.
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