Sound (as we perceive it) is 2d by the time it reaches the brain. The cochlea works as a "discrete" fourier transformer, with little hairs that resonate around

Sound (as we perceive it) is 2d by the time it reaches the brain. The cochlea works as a "discrete" fourier transformer, with little hairs that resonate around certain frequencies. It is the fact that sound could be encoded in 1d that was, at one time, astounding.