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The Mephisto Spiral is a neat toy that gives the illusion that you can continuously pull the two spiral halves apart.
You used to be able to buy one from www.grand-illusions.com/ , but it seems they no longer stock it, unfortunately.
The Mephisto Spiral was patented by Thomas Klipfel of the Union Wire Mattress Company in the year 1900:
www.google.com/patents/US646403