Granted, the resolution and accuracy could be improved, but has anyone ever even tried to model a magnetic field in 3D directly from an actual magnetic field? He basically inscribed the field in foam. Not sure what use this would have, but sometimes it helps to visualize things.
Fair warning! His silly comments regarding magnetism are painfully stupid. Just mute it and watch. The actual, interesting part doesn't even start until 3:12, so skip ahead.
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