Click the little, "Change Display," icon above, and you'll see that this sound is, in fact, a self-portrait along the San Francisco city Skyline. The audio was generated through an interpolation process in which xy values were assigned to a photograph. The data was then interpolated as audio with varying frequency and amplitude according to color placement within that grid. (x = time, y = frequency.) The result is that you can listen to a picture of the San Francisco city skyline, or anything else for that matter.
You'll note that the image appears to be distorted within the spectrograph, this is because frequency is really a logarithmic value, thus the visual reproduction of the interpolated audio data will be squished.
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