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Mobius strip necklace gold vermeil chain Psi necklace 18k gold US Size:5.5 Psi necklace 18k gold vermeil which is the one most physicists carry as the mental image even after years of quantum mechanics The Möbius strip is the simplest non orientable surface in topology The pendant follows the geometry exactly: a closed loop that you can run a finger along forever and never lift it
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