Shepard Tone - Created by psychologist Roger Shepard at Bell Labs, this illusion is made of a list of tones that seem to perpetually increase or fall. The illusion is made by super-positioning pure tones (sine waves) an octave apart. An optical illusion. Both of those circles are the https://tarisland75319.is-blog.com/42341303/illusion-of-kundun-mu-online-an-overview