The trefoil is perhaps the easiest knot to find in "nature":
Mike Hutchings' Rope Trick
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Thurston's Trefoil - Figure Eight Trick
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A trefoil near the Hollander York Gallery
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The NeverEnding Story is a connected sum of two trefoils.
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Logo of Caixa Geral de Depositos, Lisboa
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A hagfish tying itself in a knot to escape capture.
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