A Shepard tone, named after Roger Shepard, is a sound consisting of a superposition of sine waves separated by octaves. When played with the base pitch of the tone moving upwards or downwards, it is referred to as the Shepard scale. This creates the auditory illusion of a tone that continually ascends or descends in pitch, yet which ultimately seems to get no higher or lower. If you play the sound again and again you get the illusion that the sound goes ‘up’, but it’s always the same sample you hear!!! very strange…
[audio:http://jeffmilner.com/2008/06/audio-illusion.mp3] via
This is weird.
Lewis
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