In the metaphysics of identity, the ship of Theseus is a thought experiment that raises the question of whether an object that has had all of its components replaced remains fundamentally the same object...
If it is supposed that the famous ship sailed by the hero Theseus in a great battle has been kept in a harbour as a museum piece, and as the years went by some of the wooden parts began to rot and were replaced by new ones then, after a century or so, all of the parts had been replaced. The question then is if the "restored" ship is still the same object as the original.
If it is then supposed that each of the removed pieces were stored in a warehouse, and after the century, technology developed to cure their rotting and enabled them to be put back together to make a ship, then the question is if this "reconstructed" ship is still the original ship. And if so, then the question also regards the restored ship in the harbour still being the original ship as well. Source: https://en.wikipedia.org/wiki/Ship_of_Theseus
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