A 3D version of the 3rd iteration Hilbert curve fabbed by mathematician Henry Segerman turns out to be so flexible that it can be used as a bracelet.

You may have seen the postcard magic trick, that lets you walk right through a postcard using only fractal mathematics.

With a 4th iteration 3D Hilbert curve, you may now also walk right through the center of the 3cm dice created by shapeway user Srjskam.