22 - quintessence previous next

Plato also wrote:

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.