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Also interesting to nerds like me is that the annoying audio in the video is a seemingly always-increasing tone called a Shepard Tone:

http://en.wikipedia.org/wiki/Shepard_tone

edit: …and now reading that I've stumbled across the Tritone paradox which I wasn't familiar with and is equally cool.

http://en.wikipedia.org/wiki/Tritone_paradox http://deutsch.ucsd.edu/psychology/pages.php?i=206




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