 The imaginary cases that Locke employs are not dissimilar to ancient cases, such as the Ship of Theseus, reported by Plutarch. In this case, we are asked to imagine a ship that has slowly had its planks replaced with new ones. The intuition Plutarch’s case is intended to test is whether, at the end (when the ship has an entirely new material constitution), we have the same ship as before. Likewise, Locke is using cases to test readers’ intuitions about persistence and identity. But it is arguable that Locke is the first to devise such cases to specifically test readers’ intuitions about persons and the conditions under which they are the same. Locke is thus carving out a new conceptual space through such imaginary cases. A few of these will be outlined and discussed in what follows. 