“Who am I?” is the oldest philosophical question; “When am I?” is its quieter twin. Put them together and you get the paradox the modern mind both fears and adores: if time is not a single straight river, what happens to identity when it doubles back on itself? If future selves can visit past moments, are they the same person? And if the soul exists, is it bound to one body at one time? Or could it, somehow, be present in multiple bodies across history?