Shepard Tone - Developed by psychologist Roger Shepard at Bell Labs, this illusion consists of a set of tones that seem to perpetually increase or slide. The illusion is made by super-positioning pure tones (sine waves) an octave aside. /concept /verifyErrors The phrase in the example sentence won't match https://baldurs-gate-304691.blazingblog.com/35737627/5-easy-facts-about-illusion-of-kundun-mu-online-described