Having parts that correspond to one another in size, shape, and relative position; exhibiting balance and proportion around a central axis or point.
From Greek 'symmetros' from 'syn-' (together) + 'metron' (measure). The concept originated in Greek mathematics and art, describing objects where measurements on one side match those on the other, creating visual and mathematical harmony.
Butterfly wings aren't actually perfectly symmetric - each wing has tiny differences! But our brains are wired to see symmetry as beautiful because it often signals health and genetic fitness in nature, which is why symmetric faces are considered more attractive.
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