On the later Platonic dialogue from around 360 BCE.

How is nature put together? Plato speaks through the fictional Timaeus (not Socrates) to give a "likely story" about the universe, physics, and biology involving a Craftsman (Demi-Urge) who created everything based on a pre-existing perfect model (the Forms!).

Timaeus derives his whole story from the principle that the world is good, and so the Craftsman must necessarily optimize creation, with any imperfections being introduced only by the necessity involved when a perfect blueprint gets embodied to create ever-shifting, impermanent matter.

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