@Icosaprism I didn't remember it offhand (looking at knotted Riemann surface like things now): Alice universes: http://en.wikipedia.org/wiki/Non-orientable_wormhole …
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@Icosaprism I didn't remember it offhand (looking at knotted Riemann surface like things now): Alice universes: http://en.wikipedia.org/wiki/Non-orientable_wormhole …