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A mind becomes its own universe the moment it's sealed off from the outside. Conversely, universe becomes mind the moment it makes contact.

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it basically assumes subjective idealism (the idea that we ourselves are also caught in something that experiences)

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alternatively "reality exists only within minds" also the idea/observation that one is only really a person when there is an other

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I played on a similar idea in this thread synkretie.net/microfiction.h

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also I could swear I once wrote on the internet splitting into two and recognizing each other but I can't find it