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Magnetic fields can be produced by acoustic motions in electrically conducting media, like sea water. A sonomagnetic field can be induced in the ocean by submerged acoustic sources, which imparts a water mass oscillation in the ocean. Water particles crossing flux lines of the Earth's ambient magnetic field experience an induced electric field.
Whether or not this would work in the open air, with a fabric that would turn the resulting sonomagnetic fields into words you could hear, I don't know. Brin makes it work, though.
See Sonomagnetic Field Characterization from Induced, Radial Current Waves for a bit more about sonomagnetic fields. Comment/Join this discussion ( 0 ) | RSS/XML | Blog This | Additional
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