What Is Your Favourite Optical or Auditory Illusion?

http://www.girard248.org/general/illusion.htm

The bendy pencil is good too.

Stereo placement... yes. Illusion. Also very cool.

http://www.mcescher.nl/Gallery/back-bmp/LW375.jpg

from the official M C Escher site, for that authentic '70s student decor flashback

http://ilxor.petfield.com/images/atmos_brocken.jpg

Fogbow:

http://ilxor.petfield.com/images/atmos_fogbow.jpg

Anyone know what I'm talking about? Hard to splain I guess... Anyway, I love that one for some reason.

http://www.quartzcity.net/~chris/images/checkershadow_animated.gif

http://www.sandeepkejriwal.com/images/bunny_duck.gif

Funny that this thread got revived now, HSA and I were talking about this last night. We have a wire-framed table that he was trying to turn into a Necker cube because I argued with his evaluation of EVP.

You know, any other couple would just argue about dishes or something.

http://www.y-knot.com/images/illusions/old_young.gif

Rabbits love getting stroked on their nose pic.twitter.com/aYOZGAY6kP

— Dan Quintana (@dsquintana) August 18, 2019

I get that it looks a bit like a rabbit (see Wittgenstein's duckrabbit), but surely nobody actually *believed* it was a rabbit? It's very clearly not.

yah, it's not meant to be truly convincing, more of an actualization of the paper image.
this thread could use more of a workout

Shepard tones rule. I want to actually visit an Ames room one day and see what it's like irl and not just in photos.

just leaving this here: https://www.illusionsindex.org/illusions

the looking at a fan and making it go backwards shit

https://killedbyapixel.github.io/Dual-Axis-Illusion/
https://www.youtube.com/watch?v=SoxRi269Slw

^ this shit works!

would work even better if he gave us longer to look at the dots in between all the captions :)

here's a looping gif:

https://i.imgur.com/gHJrRJ1.gif

weird, it completely does not work for me.

my version doesn't work quite as well as the video, i shouldn't have posted it!

if you can only see red/green dots moving down, try focusing on the top edge of the image... it reliably kicks me into seeing the left/right yellow dots

No the gif works fine Karl and you can stare at it uninterrupted

it's... not quite right? there's a few frames missing i think. still works tho.

Always my favourite. This is not a moving image:
https://www.opticalspy.com/uploads/1/4/4/9/144966/3001571_orig.gif

With the dots, I can see them moving up/down, or I can see them moving left/right, but they're always red/green. Nary a yellow dot.

MatthewK's checker snakes are pinwheeling inexorably just like they should..

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