The optical illusions thread

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http://web.mit.edu/persci/people/adelson/images/checkershadow/checkershadow_illusion4med.jpg

― Sadie Zmith, Tuesday, 18 May 2004 09:27 (twenty-two years ago)

Is the idea that square A and square B are the same shade of grey?

― Andrew Farrell (afarrell), Tuesday, 18 May 2004 09:29 (twenty-two years ago)

Yes.

Post your optical illusions here!

― Sadie Zmith, Tuesday, 18 May 2004 09:30 (twenty-two years ago)

i don't get that one at all

― stevem (blueski), Tuesday, 18 May 2004 09:33 (twenty-two years ago)

A and B are the same colour, but they don't look it.

― Jaunty Alan (Alan), Tuesday, 18 May 2004 09:34 (twenty-two years ago)

http://www.erowid.org/culture/optical_illusion/images/archive/optical_illusion_rotating-circles2.gif

― Sadie Zmith, Tuesday, 18 May 2004 09:39 (twenty-two years ago)

re the shadow illusion- I even had to check that in MS Paint, that's pretty good.

― Ste (Fuzzy), Tuesday, 18 May 2004 09:41 (twenty-two years ago)

No, I think the point is the LETTERS A and B are the same shade, not the squares, doh.

― mark grout (mark grout), Tuesday, 18 May 2004 09:41 (twenty-two years ago)

? no, its definitely the SQUARES that are the same colour.

― zappi (joni), Tuesday, 18 May 2004 09:43 (twenty-two years ago)

yeah man check it out, i cut and pasted the areas in MS Paint- THEY ARE THE SAME SHADE

― Ste (Fuzzy), Tuesday, 18 May 2004 09:44 (twenty-two years ago)

That rotating one is grebt.

― robster (robster), Tuesday, 18 May 2004 09:44 (twenty-two years ago)

I did. I take it all back. wowz. xpost.

― mark grout (mark grout), Tuesday, 18 May 2004 09:46 (twenty-two years ago)

It is very hard to pretend you're working while doing the rotating one, though.

― Andrew Farrell (afarrell), Tuesday, 18 May 2004 09:48 (twenty-two years ago)

http://www.uweb.ucsb.edu/~kylegreen/Pics/optical%20illusion.jpg

― Simone de Beaucul, Tuesday, 18 May 2004 09:49 (twenty-two years ago)

http://www.erowid.org/culture/optical_illusion/images/archive/optical_illusion_black-white1.gif

― Sadie Zmith, Tuesday, 18 May 2004 10:01 (twenty-two years ago)

good animation of the checkerboard illusion on this thread:
What Is Your Favourite Optical or Auditory Illusion?

TOMBOT publicly questioning checkerboard illusion here:
optical illusions

― Tracer Hand (tracerhand), Tuesday, 18 May 2004 11:43 (twenty-two years ago)

I wonder if Nick's hand is alright
the email fwd optical illusion thread

― Tracer Hand (tracerhand), Tuesday, 18 May 2004 11:45 (twenty-two years ago)

http://www.grand-illusions.com/images/Dreieck.gif

― Jonathan Z. (Joanthan Z.), Tuesday, 18 May 2004 11:50 (twenty-two years ago)

Should there be any doubt:
http://www.quartzcity.net/~chris/images/checkershadow_animated.gif

― mark grout (mark grout), Tuesday, 18 May 2004 11:52 (twenty-two years ago)

I don't understand.

― cozen (Cozen), Tuesday, 18 May 2004 11:53 (twenty-two years ago)

http://www.ritsumei.ac.jp/~akitaoka/rotsnakemini.gif

― Stuart (Stuart), Tuesday, 18 May 2004 11:58 (twenty-two years ago)

it should go slower. i'll see if i can re-jigger it.

x-post yikes stuart that's awesome

― Tracer Hand (tracerhand), Tuesday, 18 May 2004 11:59 (twenty-two years ago)

Lots more where that came from.

― Stuart (Stuart), Tuesday, 18 May 2004 12:02 (twenty-two years ago)

wow that's kinda spinning me out.

― cozen (Cozen), Tuesday, 18 May 2004 12:04 (twenty-two years ago)

http://www.ritsumei.ac.jp/~akitaoka/Monspiral.gif

The "blue" and "green" in the spirals are the same color.

― Stuart (Stuart), Tuesday, 18 May 2004 12:08 (twenty-two years ago)

HEIN?

http://img44.photobucket.com/albums/v134/tracerhand/checkershadow_animated2.gif

― Tracer Hand (tracerhand), Tuesday, 18 May 2004 12:09 (twenty-two years ago)

fuck.

― cozen (Cozen), Tuesday, 18 May 2004 12:10 (twenty-two years ago)

Your brane compensates for the shadow, innit? I haven't seen that before - it's ace.

― N. (nickdastoor), Tuesday, 18 May 2004 12:11 (twenty-two years ago)

Actually that's NOT AN ANIMATED GIF.

― Tracer Hand (tracerhand), Tuesday, 18 May 2004 12:22 (twenty-two years ago)

Mr Hand, you're scaring me now.

― N. (nickdastoor), Tuesday, 18 May 2004 12:24 (twenty-two years ago)

Those right-angled triangles have broken my brain. I'm seriously fucking confused.

― Andrew (enneff), Tuesday, 18 May 2004 13:01 (twenty-two years ago)

THE LINES BEND, FUCKERS.

― N. (nickdastoor), Tuesday, 18 May 2004 13:03 (twenty-two years ago)

The solution for the right angled triangle one is that the long edge (the hypoteneuse) is slightly curved in on the top one, and curved out on the bottom one, thus creating that extra 1 square of area.

― jellybean (jellybean), Tuesday, 18 May 2004 13:05 (twenty-two years ago)

Oh, I get it now. The triangles have different angles. The overall shape is not a triangle.

― Andrew (enneff), Tuesday, 18 May 2004 13:07 (twenty-two years ago)

I had a bit of a brainfuck back there. Woah.

― Andrew (enneff), Tuesday, 18 May 2004 13:08 (twenty-two years ago)

I don't see this curve. The outlines of two pieces that make up the hypotenuse hit their gridlines at the exact same spots in both figures.

― Tracer Hand (tracerhand), Tuesday, 18 May 2004 13:11 (twenty-two years ago)

no they don't tracer, look at the third column from the right, you can see the difference there.

― CarsmileSteve (CarsmileSteve), Tuesday, 18 May 2004 13:13 (twenty-two years ago)

Yeah I get it. I guess.

― Tracer Hand (tracerhand), Tuesday, 18 May 2004 13:15 (twenty-two years ago)

Stick a ruler on your screen.

― N. (nickdastoor), Tuesday, 18 May 2004 13:16 (twenty-two years ago)

charming.

― g-kit (g-kit), Tuesday, 18 May 2004 13:16 (twenty-two years ago)

OK now what?

― Tracer Hand (tracerhand), Tuesday, 18 May 2004 13:17 (twenty-two years ago)

Do a little dance.

― N. (nickdastoor), Tuesday, 18 May 2004 13:18 (twenty-two years ago)

w00t!
i get it. when i dance, it looks like my boss is thinking "he's so sacked". nice.

― g-kit (g-kit), Tuesday, 18 May 2004 13:19 (twenty-two years ago)

These optical illusions are very powerful magic and you should not mess with them unless you know what you're doing.

― N. (nickdastoor), Tuesday, 18 May 2004 13:21 (twenty-two years ago)

But magic is good.

― Ned Raggett (Ned), Tuesday, 18 May 2004 16:47 (twenty-two years ago)

Want more of this dizzy making shit.

― Spinktor, Tuesday, 18 May 2004 16:49 (twenty-two years ago)

I have Sadie's rotating circles thing on the wall behind my desk.

― Sick Mouthy (Nick Southall), Tuesday, 18 May 2004 16:56 (twenty-two years ago)

http://www.ritsumei.ac.jp/~akitaoka/kasa.gif

― Stuart (Stuart), Tuesday, 18 May 2004 16:56 (twenty-two years ago)

Stuar = Helping.
Sick Mouthy = Mexicant.

― Spinktor, Tuesday, 18 May 2004 16:58 (twenty-two years ago)

The triangles -- why would a bent hypotenuse affect the area of the triangle? The legs of each are the same, and it's the legs you use to calculate area, not the hypotenuse.

― Leeefuse 73 (Leee), Tuesday, 18 May 2004 22:26 (twenty-two years ago)

Skipping 39 messages at this point... Click here if you want to load them all.

It ain't really persistence of vision - after (say) looking at a red patch for a while, the neurons excited (woo!) by the red will fatigue, and when they stop being stimulated, they will fire less frequently than usual, in effect indicating an absence of red - which is interpreted by yer brain as a presence of green. Or something like that.

It's the same effect as when you've been travelling on a train, and it stops at a station, and it looks like the train is travelling really slowly in the opposite direction - the neurons firing for motion in one direction have got tired, so yer brain interprets than as movement in t'other direction.

― ledge (ledge), Tuesday, 20 June 2006 10:29 (nineteen years ago)

Oh ok! Thats interesting.

― Trayce (trayce), Tuesday, 20 June 2006 10:32 (nineteen years ago)

Stare at the cross. Keep staring!

http://i51.photobucket.com/albums/f374/santosh111/illusion%20images/greenDotsillusion.gif

― ledge (ledge), Tuesday, 20 June 2006 10:49 (nineteen years ago)

That's neat!

― Gerard (Gerard), Tuesday, 20 June 2006 10:54 (nineteen years ago)

Another 'colours are the same' one.

― Si.C@rter (SiC@rter), Tuesday, 20 June 2006 11:07 (nineteen years ago)

Bah. Didn't like the .PNG file. Never mind.

― Si.C@rter (SiC@rter), Tuesday, 20 June 2006 11:07 (nineteen years ago)

eleven months pass...

http://coe.sdsu.edu/eet/Articles/ObjOver/Findme.gif

Can you see what's in the image here?

I've already been told what it's supposed to be, but damned if I can make it out.

― Pleasant Plains, Thursday, 14 June 2007 21:29 (nineteen years ago)

A dalmation?

― nickalicious, Thursday, 14 June 2007 21:32 (nineteen years ago)

Drinking water from a creek?

― nickalicious, Thursday, 14 June 2007 21:32 (nineteen years ago)

It's a dalmatian in the right of the image with its nose down in the center part. That's what they tell me because I can't see shit.

</ray_charles.jpg>

― Pleasant Plains, Thursday, 14 June 2007 21:39 (nineteen years ago)

If you've got MS Paint, Nick, trace around it.

― Pleasant Plains, Thursday, 14 June 2007 21:40 (nineteen years ago)

from where comes this "hole"

― ghost rider, Thursday, 14 June 2007 21:44 (nineteen years ago)

Click the Help Me 1 and Help Me 2 buttons here to see it (picture is inexplicably mirrored on this site though) : http://www.michaelbach.de/ot/cog_dalmatian/index.html

― StanM, Thursday, 14 June 2007 22:10 (nineteen years ago)

Looks like two tortoises having sex in the right to me.

― chap, Thursday, 14 June 2007 22:18 (nineteen years ago)

the dalmation one was once in a textbook i had once.

this thread needs noise almonds:
http://img56.imageshack.us/img56/3013/thelatestworks35cn.gif

― the table is the table, Thursday, 14 June 2007 22:28 (nineteen years ago)

http://www.maniacworld.com/cool-optical-illusion.html

(don't worry, no screaming surprises - just look at the patterns for a while and look at something else when it tells you to)

― StanM, Thursday, 14 June 2007 22:34 (nineteen years ago)

Know what's weird? Soon as I clicked on StanM's link, I saw the dog right away.

So if any of you ever want to hide from me, just turn to the left.

― Pleasant Plains, Thursday, 14 June 2007 22:35 (nineteen years ago)

don't worry, no screaming surprises

You could've warned us about the psytrance. That just made my vision go swirly, is there anything else to it? (note: I can't do magic eye things)

― chap, Thursday, 14 June 2007 22:42 (nineteen years ago)

I totally WAS worried it was gonna be a screamer; altho your intentions seem harmless I was still waiting for epilepsy-inducing dead fetus slideshow.

― Abbott, Thursday, 14 June 2007 22:51 (nineteen years ago)

Little in this life is as fiendish as that 'count the black dots at the intersections' illusion upthread.

― Just got offed, Thursday, 14 June 2007 22:55 (nineteen years ago)

xxpost: no, it's just the swirly vision thing, isn't that weird enough?

― StanM, Thursday, 14 June 2007 23:06 (nineteen years ago)

That's plenty weird, mos defs. I did not want SURPRISE TERROR.

― Abbott, Thursday, 14 June 2007 23:07 (nineteen years ago)

haha the almonds one never fails to give me the creeps

― am0n, Thursday, 14 June 2007 23:08 (nineteen years ago)

it just moves way too much. it might be sentient

― am0n, Thursday, 14 June 2007 23:08 (nineteen years ago)

the almond one makes me look at my scroll wheel with great distrust

― Just got offed, Thursday, 14 June 2007 23:11 (nineteen years ago)

this is still the best one ever:

The optical illusions thread

― StanM, Thursday, 14 June 2007 23:13 (nineteen years ago)

(it's a link to a post on this thread, not the beginning of this thread)

― StanM, Thursday, 14 June 2007 23:13 (nineteen years ago)

That video one really hurt my eyes.

― The Yellow Kid, Friday, 15 June 2007 06:24 (eighteen years ago)

sorry :-(

― StanM, Friday, 15 June 2007 06:33 (eighteen years ago)

two months pass...

Same principle as the almonds:

http://i2.tinypic.com/5x6mono.png

― StanM, Wednesday, 5 September 2007 19:41 (eighteen years ago)

one year passes...

http://img24.imageshack.us/img24/2038/imageuploadimagei.gif

― ergo almondnut (libcrypt), Tuesday, 3 March 2009 05:21 (seventeen years ago)

dope

― c♜lyn dodgers (Whiney G. Weingarten), Tuesday, 3 March 2009 05:33 (seventeen years ago)

one year passes...

wheeeeee

http://www.newscientist.com/special/best-new-visual-illusions-2010

― iiiijjjj, Sunday, 16 May 2010 20:21 (sixteen years ago)

Was looking at these yesterday! I love these. You can look at some of the past years' too, even though this one is basic I love that it works.

― Not the real Village People, Sunday, 16 May 2010 22:06 (sixteen years ago)

two years pass...

https://www.youtube.com/watch?v=tBNHPk-Lnkk

― Elvis Telecom, Wednesday, 28 November 2012 21:50 (thirteen years ago)

five months pass...

Is the train coming or going?

http://i40.tinypic.com/pykh2.gif

― StanM, Friday, 10 May 2013 07:10 (thirteen years ago)

Oh - there's a bigger version on the seamless gifs thread where someone else noticed the direction thing as well

― StanM, Friday, 10 May 2013 07:15 (thirteen years ago)

the train is blinking

― the late great, Friday, 10 May 2013 07:19 (thirteen years ago)

seven years pass...

回転して見えたらRT pic.twitter.com/WBoG7rAD2f
— じゃがりきん (@jagarikin) July 24, 2020

― Gerneten-flüken cake (jed_), Sunday, 26 July 2020 17:37 (five years ago)

three months pass...

スーパー錯視ブラザーズ pic.twitter.com/bLkFhBOCeU
— じゃがりきん (@jagarikin) November 20, 2020

― wasdnuos (abanana), Monday, 23 November 2020 04:43 (five years ago)

https://gfycat.com/enchantedclearcutblackfish

― ledge, Monday, 30 November 2020 15:53 (five years ago)

o_O

― the late great, Monday, 30 November 2020 16:22 (five years ago)

these new super-potent strains of optical illusion are a harsh escalation from the impossible tridents of yore. those were nice and simple, you could look at a few and enjoy them and move on, but this terrifying new class of animation leaves me indignant towards my own occipital lobe and emotionally shattered for the rest of the day

― the burrito that defined a generation, Monday, 30 November 2020 16:43 (five years ago)

otm

― the late great, Monday, 30 November 2020 17:29 (five years ago)

two weeks pass...

This is blowing my mind tonight

pic.twitter.com/7Tjb22WD10
— Perfectly timed (@Perfectlycaptre) December 18, 2020

― Two Meter Peter (Ste), Friday, 18 December 2020 21:23 (five years ago)

two months pass...

https://ironicsans.substack.com/p/24-adventures-in-stereograms

lots to see at that link but this one is fucking unbelievable

http://i.imgur.com/wGgv96V.png

― G.A.G.S. (Gophers Against Getting Stuffed) (forksclovetofu), Monday, 1 March 2021 06:08 (five years ago)

Magic Eye pictures - can you see them or not?

― Being cheap is expensive (snoball), Monday, 1 March 2021 13:19 (five years ago)

great stuff. lol @ “Stare-E-Os”

― brimstead, Monday, 1 March 2021 16:34 (five years ago)

My brother gave me the book Masters of Deception for my birthday last year and it has some photos of £d printed images from Escher in it. Must have a closer look at the images, I think it does show alternative views that show how they were made.
Like you shouldn't be able to make a phyiscial Castrovalva which i think is one of them images done this way.
Not sure this will work
https://www.ponoko.com/blog/ponoko/printing-mc-escher-for-real/

― Stevolende, Monday, 1 March 2021 16:51 (five years ago)

omg I think I saw a Magic Eye properly for the first time with that Running Free! I was staring at it for ages on my phone and couldn't get it, but on my bigger screen I can see it!

― kinder, Monday, 1 March 2021 17:52 (five years ago)

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