Polarized Radio Waves
The two towers of this exhibit contain a microwave transmitter and receiver respectively. Music from a radio broadcast is sent from the transmitter and is heard at the receiver. The wavelength of these microwaves is a few centimeters or so and are polarized vertically. A simple metal kitchen grate can be used as a polarizer to block the microwaves (grate vertical) or allow them to pass (grate horizontal).
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