Having balanced proportions; identical on both sides of a dividing line or around a central point. Displaying regularity and correspondence in size, shape, and arrangement of parts.
From Greek symmetria meaning 'due proportion,' from syn- (together) plus metron (measure). The concept entered Latin as symmetria and evolved through Old French before entering English, always maintaining its core meaning of balanced measurement.
Humans are neurologically programmed to find symmetrical faces more attractive, possibly because symmetry indicates genetic health and good development - yet complete facial symmetry actually looks unsettling to us, which is why perfectly symmetrical computer-generated faces fall into the 'uncanny valley.' Nature achieves beauty through near-symmetry with subtle variations.
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