As mentioned previously, a superconductor can levitate below a magnetic track turned upside down.
Here's a closer look:
To see the explanation why it won't fall away from the track, see the explanation in the link above.
Also, it turns out that, since the Open House two months ago, the demo lab has obtained another piece of superconductor. A complete, unbroken piece:
If anyone's interested, the material of this superconductor is yttrium barium copper oxide. It is the first material discovered to exhibit superconducting properties above 77 K, or boiling point of nitrogen, thereby making it much cheaper for experiments on superconductor to be carried out (and for me to play with).
Here's another view of the superconductor in action:
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