The false fundamental idea appears a clear example of how technology fool's the brain, in fact, in real terms I guess it's an example of VR? Not sure how accurate my thinking is, but I'd assume that throughout millions of years of evolution, any given series of harmonics wouldn't have been heard without the fundamental being there somewhere, even if it was below the threshold for hearing (it had to be there to have generated the harmonic series in question). So our brains evolved to recognise, and then to predict the presence of the fundamental from the harmonic series. And as we can now produce those harmonic series with the aid of tech, we are in fact tricking the modern brain into hearing something that isn't there because our ancient brains learned that it was a reliable prediction? Are there any other similar acoustic phenomena?