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Plato continued:
And there is a fifth figure (which is made out of twelve pentagons), the dodecahedron — this God used as a model for the twelvefold division of the Zodiac.

Later, people said the heavens were made of a fifth element called "aether" or the "quintessence".

You can read more about this in the Wikipedia article on aether.

The rotating dodecahedron was created by Cyp, who placed it on Wikicommons under a GNU Free Documentation License.