“We are what we pretend to be.” — Kurt Vonnegut
Time travel is about identity, because people are products of their times: when a character is unmoored from their own time and plonked into another one, it inevitably brings up the question of who they actually are, where their identity resides.
Well, okay, maybe not inevitably. There are plenty of kids’ time-travel stories where the main character(s) visit the past like tourists, look around, learn something (“Wow, life was tough on the prairies/in the Revolutionary War/in Medieval Europe!”), and go back home, without any identity crises at all. But even in those, unless they’re invisible (that happens sometimes too), the time travelers have to account for their presence to the contemps somehow: they need find a way to blend in and pretend, sometimes to everyone, sometimes to all but a few confidantes, that they belong there. The time traveler has to, in a sense, become an undercover agent.
But when identity comes into the mix in a deeper way, it gets at a haunting human question: if we lived somewhere else, or sometime else, would we be someone else too? Would we still be ourselves? What’s that self consist of, anyway? Is it the physical stuff around us? The people we know? Our names? Or is it something deeper, more essential, harder to destroy?
[I think we’re not in New Rochelle any more...]