International Year of Sound 2020

Audio Demos

having fun with audio

Infinite Staircase

This demonstration presents an auditory illusion, the acoustical equivalent of an infinite staircase. The pitch of the sound (a minor chord) increases at each step, apparently going up and up and up. However, the sound never does get higher.

Shepard tones and Risset glissandos are related auditory illusions.


© 2017-2019 International Commission for Acoustics