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1. platonic solids
plato, after whom they are named, described the platonic solids in his work "timaeus"
he attributed the 4 classical elements to each of them:
tetrahedron being fire
octahedron being air
hexahedron or cube being earth
icosahedron being water
the dodecahedron being the fifth element, the quintessence (quint=5), it contains all the other platonic solids, and each of them can be constructed from it. it is the highest essence
later aristotle would call it the aether
there are no more than 5 platonic solids