This dialogue is Plato’s treatise on natural philosophy. Integrating Pre-Socratic thought with his own theory of ideas and metaphysics, he attempts to bring everything that exists under reason; from the Cosmos to living creatures to human diseases. He sees everything created as product of necessity, having a cause and tending towards an end; the Universe as one whole being having a soul, and everything that exists as a work of design intelligible to the human mind.