Shepard Tone - Produced by psychologist Roger Shepard at Bell Labs, this illusion is made of a set of tones that seem to perpetually rise or tumble. The illusion is made by super-positioning pure tones (sine waves) an octave aside. Other illusions are based on common assumptions the brain https://touhou-danmaku-kagura-pha21975.bloggerchest.com/35709058/the-illusion-of-kundun-mu-online-diaries