The holes of two eye sockets and the holes of nasal passages in the skull, the protrusions of nostril, ear and horn, the divisions in the pelt of a piebald animal, the foliate cusps of a leaf or a flower: all the variable bipartite symmetries of nature. The divided cell of mitosis that become the two nostrils, eyes, ears, hands, feet, or the two sides of the brain, heart, or the two chambers of the lungs or the symmetry of the kidneys.
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