The Ship of Theseus

Surface

The Ship of Theseus is one of philosophy's oldest paradoxes. The Athenians preserved Theseus's ship as a monument, replacing planks as they rotted. Eventually every original plank had been replaced. Is it still the same ship? And if someone collected all the original planks and rebuilt the ship from them, which one is the real Ship of Theseus?

Middle

The paradox probes the nature of identity over time. What makes a thing the same thing? Continuity of matter? Continuity of form? Continuity of function? Continuity of history? Each answer creates new problems. If identity requires continuous matter, you are not the same person you were seven years ago, since most of your cells have been replaced.

Deep

The Ship of Theseus is not just a puzzle about ships. It is the central question of personal identity: are you the same person who started reading this? The same person who made promises a decade ago? The same person who will be held responsible for your actions tomorrow? Identity may not be a thing you have, it may be a story you tell.