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Magnetic
lines of force can be seen and felt using a large magnet and several
pounds of black sand (magnetite) or iron filings. The sand follows
the magnetic lines of force and can be made to form images of the
magnetic field. The sand, (without dirtying one's hands) provides
a very pleasant and unusual tactile sensation because of its attraction
to the magnet. Magnetic "castles of sand" can also be
built.
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