This is a really neat toy! When you toss it, it sort of turns inside out, changing colors. The curved body panels that make it look like a sphere hide an internal structure that is a cube; or really, two tetrahedrons embedded in a cube; and when it hits its activation energy, the tetrahedron becomes its dual, swapping faces and vertices.

The profile of those body panels is really clever too, because they manage to just slide past each other while this is happening.

There have been a few papers written on this thing, but most of them are behind paywalls. Here's one that isn't, from the amazingly-named "Journal of the International Association for Shell and Spatial Structures", which contains this illustration of how the nodes move:

It's normal to buy a $9 kids' toy and then search for journal articles on it, right? Anyway, if this toy is patented, I'll bet the illustrations in there would be informative, but I haven't been able to find one. It's not quite "Bit" from Tron but it will do.

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