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We used to have something like this at the Childrens museum in Indy. The discs were probably on 7 feet tall, and about 50-70 apart. *But* if you were standing in front of the "mic" (which was also the focus point for the parabola you could litterally hear a whisper made from the same spot accross the room. A room filled with screaming children no less.
I never gave it much thought, though I've always rememdered those things. It was just so amazing that you could hear someone whisper something.
edit: I still spell like a three year old
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