The pasilalinic-sympathetic compass, also referred to as the snail telegraph, was a device built to test the hypothesis that snails create a permanent telepathic link when they mate.
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The device was developed by French occultist Jacques-Toussaint Benoît (de l'Hérault)
a man from a culture that considers snails not only edible, but a délice 🤷
The device also provided inspiration for the Japanese manga series One Piece, which includes Den Den Mushi 'transponder snails' that function as telephones, fax machines, and surveillance cameras.

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