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the brain. In your completely silent brain, you listen to symphonies,
and hear all of the noises in a crowded place. However, were the
sound level in your brain measured by a precise device at that moment,
complete silence would be found to be prevailing there.
As is the case with imagery, decades of effort have been spent in
trying to generate and reproduce sound that is faithful to the original.
The results of these efforts are sound recorders, high-fidelity systems,
and systems for sensing sound. Despite all of this technology and the
thousands of engineers and experts who have been working on this en-