This pyrolytic graphique square floats between four 12mm neodymium magnets. North/south poles alternate in order to get the square “trapped” and to cause the levitation effect.
The floating square is pyrolytic graphite, which is extremely diamagnetic. [...] In effect it is a single crystal of graphite, and because the resulting graphite is very highly ordered, pyrolytic graphite is extremely diamagnetic. Also the density of pyrolytic graphite is fairly low. The combination of these two factors - the low density and the strong diamagnetic effect - makes this amazing demonstration possible.
Source: http://www.grand-illusions.com/
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