You can go the simple iron filings on a white piece of paper route if you want to see the invisible fields surrounding a
magnet. But I prefer this
DIY contraption which carves 3D foam sculptures of them instead.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/dUiMHAph_dk/diy-machine-makes-3d-carvings-of-magnetic-fields
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