http://www.theneocube.com/

ok so it looks like ball bearings but they are powerful magnets and you can make lots of 3d geometrical shapes. is it a puzzle? mabey. I think its cool how you can challenge your self to link different polyhedrons together in the fewest moves without taking the hole thing apart. invent a sequence, time it, upload a video, challenge your friends. also good for the puzzle builder who wants to look at a specific polyhedron on a physical model that can be made in seconds.

Yes, it has been discussed before: http://www.twistypuzzles.com/forum/view ... =7&t=10894
I have one and it is fun to play with. Although most of the time my girlfriend wears it as a bracelet.

Thomas

It's not really a puzzle, more a plaything. You can make pretty much all polyhedra with it. The dodecahedron is a bit unstable though, because all sides are pentagonal. But besides polyhedra there are much much more shapes you're able to make.
But as Thomas said it's been discussed before

Sjoerd