Reading Time: 6 minutesWhat is the Shepard tone illusion? Definition & Meaning The Shepard tone illusion is a sound built from multiple tones spaced one octave apart, shaped with a bell-like loudness curve so the combined pitch seems to rise or fall endlessly even though the pattern repeats in a loop. First, here’s a piece of code for… Continue reading What Is the Shepard Tone Illusion? Definition, Science & Film Use