Impossible 3D Stairs with Illusory Music

Follow the steps in either direction.  They go on forever no matter which way you go. These steps are musical steps.  Mouse-over to hear an idividual note, or mouse the buttons to play a simple repeating song with 12 notes; one for each step.  Listen to the musical notes, and play the song in both directions. Do the notes get higher on the way up the stairs? Where does the song begin and where does it end?

The Impossible Staircase is cleverly "engineered" to be endless. The song uses a special kind of chord contruction and is called the Shepard Scale.

Flash Demonstration : 2010 Tony Azevedo.

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