 But what does it mean to say that an individual exists in a merely possible world? And—even if we accept that paraphrases of modal statements in terms of possible worlds are in general acceptable—does it even make sense to say that actual individuals (like you and your neighbour’s cat and the Eiffel Tower) exist in possible worlds other than the actual world? To know what a claim of transworld identity amounts to, and whether such claims are acceptable, we need to know what a possible world is, and what it is for an individual to exist in one.