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Helianthus · 4833 days ago · link · · parent · post: How Would You Teach Left from Right to an Alien Civilization?
I'm not so certain that this would be that difficult. Left and Right, Clockwise vs. Counterclockwise are simple opposites; that is to say, they are emblematic of opposities in that it's arbitrary what you call one ('flurgle') as long as the other is not-flurgle.
Maybe it's because "Alien Civilization" to me automatically means both civilizations are probably advanced enough to understand spin-up and spin-down--the fact that we use a right-handed coordinate system by convention, but in a left-handed system spin-up is spin-down and spin-down is spin-up--so any contact with such a civilization would have us both shrugging our shoulders and going "Huh, yeah. Opposites."