The Shepard tone is an audio illusion which seems to get forever higher or lower but never really does!

The 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 upward or downward, 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

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