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The Ship of Theseus: If You Replace Every Part, Is It Still the Same Thing?
💡 The Ship of Theseus reveals that identity isn't a fixed property — it's a narrative about continuity that breaks down when examined closely, whether applied to ships, bodies, or institutions.
The ancient Greek hero Theseus kept his ship in the harbor of Athens as a memorial. Over the years, as planks rotted, the Athenians replaced them with new wood. Eventually, every single piece of the original ship had been replaced. The question that has haunted philosophers for 2,500 years: is it still the Ship of Theseus?
The problem gets worse with a twist attributed to philosopher Thomas Hobbes: what if someone collected all the old planks and reassembled them into a ship? Now you have two ships — one made of all new parts in the original configuration, and one made of all original parts in the same configuration. Which one is the "real" Ship of Theseus?
This isn't just an abstract puzzle. Your body replaces most of its cells over 7-10 years. Are you the same person you were a decade ago? When a band replaces all its original members, is it the same band? When a company changes its entire leadership, products, and mission, is it the same company? The Ship of Theseus reveals that identity might not be a fixed property of things — it might be a story we tell ourselves about continuity.