 Plato discusses and re-formulates several of the metaphysical considerations that back up proto-skeptical and early skeptical intuitions. The relevant passages are spread out over a number of dialogues, among which passages in the Phaedo, Republic, Theaetetus and Timaeus are perhaps most important. In these dialogues, Plato develops some of his own metaphysical ideas. He also engages critically with metaphysical theories that he does not ultimately adopt. However, in order to explore these theories he formulates them in detail, often invoking a Pre-Socratic ancestor as a proponent of a given idea. These discussions are a great source of inspiration for Pyrrhonian skeptics, who are interested in what may be called a metaphysics of indeterminacy (Bett 2000, Vogt 2021).