The key phrase eikōs muthos is standardly translated ‘a likely tale’, suggesting an empiricist philosophy of science quite alien to Plato’s outlook. I argue for translating, in the first instance, ‘a reasonable myth’, and focus on the point that the reason involved in world-making is practical, not theoretical. This should make a significant differenceto how we assess the Demiurgic arguments reported to us in the dialogue.

D. In doing x an agent acts incontinently if and only if: 1) the agent does x intentionally; 2) the agent believes there is an alternative action y open to him; and 3) the agent judges that, all things considered, it would be better to do y than to do x.