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The dress colours inside the two rectangles are identical.
I love optical illusions.
Also, I don't know who drew this image. Sorry for not giving credit!
Our perception of colours and shades is heavily dependent on context. We may believe our eyes to be able to tell objective reality, but our brains are incredibly subjective in the way they convey that reality.
Like in this image, which is even more striking, squares A and B are identical shades of grey.
(credit: Edward H. Adelson/Pbroks13/WIkimedia Commons/CC-BY-SA 4.0)
My takeaway from this post is that, it turns out, seeing isn’t actually believing. Who knew?
@XanIndigo Nuh-uh, not doing this again 
@sindarina The dress will never truly be gone!
@XanIndigo It's a cool illusion, that's for sure (the board). If I squint hard enough, I can see they're the same colour.
@XanIndigo my takeaway from this post is that color alone is meaningless to the human eye (brain?) without respecting its surroundings
@daniel_bohrer It’s more than just colour, too. A lot of human perception is based on context. Like in this image, the two orange circles are the same size but we perceive them as different because of their surroundings.
#FBPE @XanIndigo Some people who knew are the museum in Bradford, this week called "National Science and Media Museum", whose strap line last time I visited (1980s) when it was much more concentrated on photography, film and suchlike was "The Camera Always Lies".
@XanIndigo I did find a version with Japanese text, and what looks like a possible credit, but I am unable to read it.
@sindarina I think that’s the name in the bottom right. It looks like a pun but it’s a little tricky to explain – it loosely says “two are two” but with the first part also spelling the name Niko.
Japanese wordplay sounds so absurd when you try to describe it in English 
@XanIndigo @sindarina Der Text lautet:
»Blauschwarz an hellen Stellen Platin an dunklen Stellen
Sie haben beide die gleiche Farbe.
Lass uns mit einer Pipette nachsehen
Optische Täuschungen sind unheimlich!«
Und der Text unten rechts:
»Zwei kleine Mädchen«
(Übersetzt mit deepl)
@XanIndigo I literally did not believe you (even zooming in and looking at the two areas) until that second picture. My brain is now trying to side-eye itself.
@XanIndigo The fine image-makers of Wikipedia used the same idea for illustrating the #TheDress illusion. 
image CC BY-SA 3.0 Jahobr; based on a work by Kasuga~jawiki, vectorized by Editor at Large; source https://commons.wikimedia.org/wiki/File:Wikipe-tan_wearing_The_Dress.svg
Look like some text was cropped. Maybe t
his might help find the original version...
@XanIndigo Here it is with just the dress in the box isolated.
@XanIndigo how dare you trick my brain, i don't understand this 
@XanIndigo I had to get out an image editor and a color picker. Good grief.
@cgranade Remarkable, isn’t it?
@XanIndigo It really is. I believe you, but despite even getting out a color picker and verifying, I still kind of don't? It just doesn't want to fit into my brain somehow, it's incredible.
@cgranade I know just what you mean. Even when you can see through the illusion, your brain just doesn’t want to accept it.
@XanIndigo Oh, no.not this again. Will balloon boy and llama chase be far behind?
@XanIndigo (I share it because I like the third picture it makes my brain see the robe in a "fluo" blue and black color on the left)
"The dress colours inside the two rectangles are identical."
An explanation: the "intensity-color" or IC (intensity of red, green, blue), of the light reflected off an object, depends as much on the "reflectivity-color", or RC, of the object, as on the IC of the incident light. To judge RC, our brain has to take cues from the scene to compensate for the incident IC. Interpreting the rectangles as areas with different incident IC it derives different RC for same reflected IC.
And an explanation why the brain interprets the image in this way:
On the assumption that the textile bands in the dress have the same reflectivity-color, the intensity-color of the incident light (were this an actual scene) must be different, because the intensity-color of the reflected light is not the same.
The "color of the dress" refers to its reflectivity, this must not be confused with color of the reflected light, disregarding that of the incident light.
@sibrosan @XanIndigo I think this is not the explanation. See:
https://mastodon.social/@niun/109972937074483780
@niun @sibrosan @XanIndigo I don't understand: I zoomed so that to get only a part without background nor line continuation, and the color still seems different. Why so? My brain "remember" the context and lies about what it sees (as often)?
@XanIndigo I refuse to believe that statement.
Colour is an illusion created by the brain in an attempt to make sense of the information our eyes send it 
@XanIndigo I knew about the original Dress Color Discourse, but I actually had to copy the image and then cut/paste to make myself see it!
@XanIndigo@writing.exchange On Firefox: Menu > More tools > Eyedropper > Holy fucking bingles
@XanIndigo This applies to sounds too. I listened to this terrific podcast episode about sounds & illusion and heard "ghostly voices" when there were none. The preceding sound clip to that contextualized my brain to keep hearing the voices even after they'd stopped.
I came across this beautiful phrase that our brain constructs it's own metaverse because there's just too much info in "reality" to take in.
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@XanIndigo Oh no, not "the dress"! 
https://knowyourmeme.com/memes/the-dress-what-color-is-this-dress
@XanIndigo fascinating. I was expecting the effect to be dependent on the continuation of the dresses colour from outside the rectangle. But it is only the background that is relevant.
@XanIndigo I don’t like your tone.
Ⓥ
@XanIndigo GET OUT OF MY BRAIN!!!!
@XanIndigo This makes a good argument for being conservative with one's choices of colors used in a piece of art or animation. Not only does it save time on coloring, it can also really mess with one's head when presented in this format XD
@XanIndigo LOL, the final answer to the "The Dress"
Ik begrijp dat wanneer je het plaatje in de toot (?) van @XanIndigo ziet, dat je ogen je kunnen bedriegen. Daarom heb ik screenshots van alleen die rechthoeken naast elkaar gezet. Dan zijn die kleuren toch echt niet identiek
@MangoHier
@JohannesPrakken @XanIndigo het gaat om de kleuren van het jurkje in de rechthoek. Zie ook de replies op de oorspronkelijke toot!