"If you put on headphones, and listen to one tone in the left ear (say, 440 Hz) and a slightly different tone in the right ear (say, 446 Hz), then you will hear beating between the two tones, at (of course) 6 Hz -- the difference -- even though there's no actual physical interaction between the frequencies. It's all done in the gray matter."
Quoted from Darthmouth's Gamelan Listserve I subscribe to. :)
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