Shepard Tone [Audio Illusion]

I created this video for my list of 8 mindblowing audio illusions over at:
meteoritesound...
There are so many Shepard tones out there. But this is a perfect example where you won't hear any tones beginning or ending. You can see how it's all working by looking at the spectrum on the screen. The tones feed in from the bottom continuously and move up.
The plugin used to generate the tone was the synthesizer Vital.

[@zaini_kuya]

Sound like a fan

[@esrah1193]

Yes

[@nativeTania]

I know how this is an Illusion. It never goes up, and it never goes down.

[@billcipher7337]

Amazing right?

[@joeycaridi3030]

Synthesizer shepard tone

[@EJBarrois]

I can hear the transition and guesstimate the loop to be about 12 seconds long. Hello. I am a nerd.