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By the way, the order parameter of liquid crystal has a RP＾2 ( real projective plane ) -like structure, we must ‘4-dimensionally’ paste a punctured ball with a Mobius-band to realize such a projective plane.
It’s told that people in Jyoumon-period (縄文時代) have an ability to 4-dimensionally perceive various objects, in the sense, their abilities is suitable for dealing with such an order parameter.
