Brian Cotnoir

“Plato's theory of the elements was drawn from the Pythagoreans. In Timaeus, Plato describes the four elements in terms of the five regular geometric solids that now bear his name, the Platonic Solids. The triangle is the fundamental building block of these solids, which are: the Tetrahedron— Fire, built of three triangles; the Octahedron—Air, made of eight triangles; the Icosahedron—Water, made of twenty triangles; the Cube— Earth, made of twelve triangles or twenty-four triangles; and the Dodecahedron— Space or the Quintessence, made of sixty triangles.”
― Brian Cotnoir, Practical Alchemy: A Guide to the Great Work