# Ula-Ula man's island

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Mobius gear

From Wiki introduction to Möbius strip:

The Möbius strip or Möbius band (…) is a surface with only one side and only one boundary component. The Möbius strip has the mathematical property of being non-orientable. It can be realized as a ruled surface. It was discovered independently by the German mathematicians August Ferdinand Möbius and Johann Benedict Listing in 1858.
(Neatorama)