Shepard Tone - Made by psychologist Roger Shepard at Bell Labs, this illusion includes a list of tones that seem to perpetually rise or tumble. The illusion is produced by super-positioning pure tones (sine waves) an octave aside. Other illusions are depending on normal assumptions the brain would make https://purewingcore54219.blogunok.com/35900214/illusion-of-kundun-mu-online-an-overview