# Shepard tone is a sounds that keeps getting higher and higher forever At least that's the way it sounds like. The truth is that it's an auditory illusion of consisting of a superposition of sine waves separated by octaves. Listen for yourself: <iframe width="560" height="315" src="https://www.youtube.com/embed/BzNzgsAE4F0?si=-B4AMs-AiQYmmdhq" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe> ## Road signs - [[Fun with music]]