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This latest version of Mikal Hart’s original reverse geocache puzzle–a box that only opens in one location on the Earth’s surface–is by Markus. At just 3.75″ on its longest side, Markus’s box is by far the most compact and elegant version of the puzzle I have seen yet. [via Hack a Day]

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Sean Michael Ragan

Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and makezine.com. My work has also appeared in ReadyMade, c’t – Magazin für Computertechnik, and The Wall Street Journal.


  • http://www.facebook.com/mhockey2 Marc Hockey

    sell me this mapexman86@hotmail.com either that or make a detailed video on where to obtain parts as well as instalation.

  • http://www.facebook.com/mhockey2 Marc Hockey

    sell me this mapexman86@hotmail.com either that or make a detailed video on where to obtain parts as well as instalation.

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