The Treatise of Timaeus the Locrian on the Soul of the World and Nature (Ancient Greek: ΠΕΡΙ ΦΥΣΙΟΣ ΚΟΣΜΩ ΚΑΙ ΨΥΧΑΣ; Latin: Timaeus Locrus) may not have been written by Plato. The Pythagorean philosopher Timaeus describes the creation of the world by God and the Demiurge using the eternal forms as guides and matter composed of Platonic solids. Painting: The Magic Circle by John William Waterhouse.