What Is Your Favourite Optical or Auditory Illusion?

Did I already answer this? I love barberpole tones. Underused imo

The “Adelson's Checker-Shadow Illusion” in Fuck the NRA’s link upthread is my favorite.

red/green dots is a bit of a cheat - if you follow a single dot going down it stays red or green, if you follow one going across it changes between red and green quickly enough to be perceived as yellow. doesn't feel like there's any brain hacking or uncovering secrets of how perception works.

I first became aware of the Shepard Tone when some scientist chose it as one of his records on Desert Island Discs years ago. Imagine, you can pick just seven pieces of music, and that's one of your choices. Bloody boffins.

This guy: https://www.bbc.co.uk/programmes/p0093x2r

Kitaoka again - these are perfectly concentric circles of shaded elements
https://www.syfy.com/sites/syfy/files/styles/2280x1280/public/kitaoka_spiral.jpg
and these are two perfectly concentric circles
https://www.syfy.com/sites/syfy/files/styles/2200xauto/public/kitaoka_circles.jpg
Source: https://www.syfy.com/syfywire/can-you-make-your-brain-not-see-this-circle-illusion

Thats really breaking my mind

there are 16 circles in this picture pic.twitter.com/FSKci9034D

— j.d. (@jiveDurkey) June 30, 2020

oh damn, that's some magic eye shit

Do hallucinations count? For about a year I was having hypnagogic auditory hallucinations (reverse sleep paralysis - being partially asleep instead of awake) regularly, once I figured out I wasn't going crazy I started to enjoy them.

thanks for wrecking my mind Dr Kitaoka
https://i.imgur.com/2Lz4sBt.jpg
(not a GIF)

That's not doing anything for me (on my phone)

You don't see the black centre expanding? It works far too well on me (including on my small phone).

didnt work on my smartphone but on my big monitor its like BWAAAAAAAAAAAH

works for me, the Nothing is coming