Theory: The symbolism on doors is so heavy because passing through one coincides with a change of environment (and accordingly, mind).
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Also doors, together with locks, separate what is here from what is there more effectively than mere distance can. Compressed distance?
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In this sense, wormholes are archetypical doors: space is the wall, the hole is the doorway, and it spans a great spatial/temporal distance.
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Note that we employ a great number of door/lock metaphors when talking about our minds. What would be the metaphors of a doorless society?
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Would their space look smoother than our wrinkly, walled and doored one? Would they talk of paths to take instead key insights?
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