I came across this video that shows what happens when you embed ferromagnetic particles into putty to make it magnetic and then put a neodymium magnet (these are very strong magnets) near it. The caption to this video says that it was taken over 1.5 hours at three frames per second and then played back at 24 fps. (This cannot be right because then the playback should be a little over ten minutes and not 52 seconds.)
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