Each particle, or corpuscle, of water is a regular icosahedron (20-sided geometrical solid). This is what water particles look like, according to Plato’s description in the Timaeus. In the center is the water-particle Plato describes at 55b, with 6 scalene triangles making up each equilateral face of the icosahedron. On the left is a simpler “isotope” with 2 scalene triangles per face; on the right is a more complex “isotope” with 8 scalene triangles per face.
Image taken from Friedländer, Plato, vol. 1, An Introduction.
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