The Ship of Theseus
Written by Studio AM.
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Imagine a wooden ship kept in a harbor as a monument. Over the years its planks rot and are replaced one by one, until not a single original piece remains. Is it still the same ship? Now suppose someone gathered all the discarded planks and rebuilt the original vessel from them. Which vessel should count as the original ship: the restored one in the harbor or the reassembled one in the workshop?
The puzzle asks what we mean when we call something the same over time. We speak as if identity were a simple fact, a label that either applies or does not. The ship raises a difficulty for that view. Different criteria can produce different answers. We might prioritize the original material, the continuing structure, or the ship's history and function. Each choice needs a reason.
The problem is not confined to ships. A person can change greatly in appearance, habits and beliefs while continuing to be recognized as the same individual. A river keeps its name though no drop stays in it. An orchestra survives the retirement of all its players. In each case, the question is which kind of continuity matters.
Perhaps identity is less a thing an object possesses than a story we choose to keep telling about it. That is one possible response, not a settled answer. Someone who gives priority to original material may disagree, and the puzzle asks us to explain why we favor one criterion over another.
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Questions
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Question 1 of 4
What is the main point of the passage?
The answer is A: Different criteria can lead to different judgments of identity over time.
The ship and later examples introduce competing criteria, including material, structure and history. The closing interpretation is offered as one possible response.
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Question 2 of 4
In the second version of the puzzle, what is built from the discarded planks?
The answer is B: A second vessel using the discarded original planks
The workshop vessel is built from the discarded planks, while the harbor ship has received replacements over time.
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Question 3 of 4
The examples of the body, the river, and the orchestra are used to show that:
The answer is A: Questions of continuity arise in people, natural features and groups as well as objects.
The examples follow 'The problem is not confined to ships' and show several ways something can change while retaining an identity.
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Question 4 of 4
What does 'vessel' mean in this passage?
The answer is A: a ship
Here 'the original vessel' refers to the boat rebuilt from the old planks.
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