There’s 60 feet between the Whisper Dishes in the Big Science Park outside at CoSI.
That’s Charlie in the teal shirt. He whispers and I can hear him, clear as a bell, all those sixty feet away. Amazing.
“Whisper dishes, also known as acoustic mirrors, are parabolic-shaped devices that collect and reflect sound waves, allowing for communication over distances, even at a whisper. They work by focusing sound waves onto a focal point, where they can be easily heard, and then reflecting those waves to another dish, where they are focused and amplified again”