Conversation

What physical embodiments of portals between worlds have been imagined in sci-fi/fantasy? My starter list: Rabbit hole (Alice) Subtle knife (dark materials) Wardrobe (Narnia) Phone booth (Doctor Who) Platform 9 3/4 (Potter) Wormhole with gate (Stargate)
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What’s the one where there’s teleportation devices even in people’s houses so they have rooms on multiple planets but it turns out when they teleport they die and the AIs are using their dying thoughts to power themselves?
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No, not Thor - Dirk has to learn to turn his head by a fraction of a molecular width or something silly & poetic like that.
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