There's a YouTube channel called "ASAP Science" where they post one video a week where they explain a different scientific fact in ways non-science people can understand.  About four million people subscribe to it.

One of their coolest videos is "Can You Trust Your Ears?" where they talk about audio illusions . . . where you hear things differently based on what you're SEEING.  They also talk about something called the "Shepard Tone Illusion."

Basically, if you hear two notes rising at the same time, and they're exactly an octave apart, your brain doesn't notice if the top note suddenly drops down an octave.  So it sounds like the notes keep going up and up forever, even though they're not.

Andrew Redington, Getty Images
Andrew Redington, Getty Images

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