Each particle, or corpuscle, of earth is a cube (six-sided geometrical solid). This is what earth particles look like, according to Plato’s description in the Timaeus. In the center is the earth-particle Plato describes at 55b-c, with 4 isosceles triangles making up each square face of the cube. On the left is a simpler “isotope” with 2 isosceles triangles per face; on the right is a more complex “isotope” with 8 isosceles triangles per face.
Image taken from Friedländer, Plato, vol. 1, An Introduction.
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