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Shepard's Scale
Like the endless staircase, these twelve musical notes go up or down forever. It's impossible! Pass your mouse over the dots one at a time in both directions. Listen carefully. Do the notes get higher in one direction and lower in the other? Which note is highest? Lowest? Each note is really a chord made up of six notes in six different octaves. Volume shifts and ambiguous octave positions make this audio illusion happen.
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Applet: ©2001 Tony Azevedo. |
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