They are geometrical forms which are said to act as a template from which all life springs. They are named after the ancient Greek philosopher Plato. To the Greeks, these solids symbolized fire, earth, air, spirit (or ether) and water.
Ouroboros: An ancient symbol frequently used in alchemical illustrations to symbolize the circular nature of the alchemist's opus. Often represents self-reflexitivity or cyclicality, especially in the sense of something constantly recreating itself.