Aural Illusions: The Shepard Tone and Tritone Paradox

The Shepard tone is a REALLY interesting aural illusion.
It’s created by a set of sine waves harmonized in octaves, with amplitudes (loudness) that are

You hear a tone that continually keeps ascending or descending without actually changing in pitch.

The Shepard Tone Aural Illusion.

It is better explained here:

How To Create A Shepard Tone Illusion.

Then there is also the Tritone Paradox.

The Tritone Paradox.

The tritone paradox is the aural illusion that is created when you play 2 Shepard tones a tritone apart as a harmonic interval. (meaning: played simultaneously)
This illusion is heard as descending by some people and ascending by others.

Conclusion

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