A few days ago i was sent this amazing illusion (thanks Karen). The illustration below appears to show green and blue spirals…..


But in fact the apparent green and blue are exactly the same colour! Don’t believe me? Well, I put the image into photoshop and changed all of the other colours to black and you get this…..


I find that utterly jaw dropping. What do you think?

Update: A few people have pointed out that you can have the creepy experience of the illusion vanishing as you zoom in in the image!

Update2: Another great version of it here.

P.S. I am not sure who created this, so if anyone can find out let me know and I will obviously credit it. the link I was sent it here. Just found out that it was created by Kitaoka (thanks Rob).


  1. Wow. I couldn’t believe it at first, but after staring at it and really focussing, I can force the colours to look the same. I dunno how much of that is overcoming the illusion, and how much is deluding myself enough to cancel out the initial illusion. Science!

  2. That’s pretty impressive, although there is a bit of a digital-image artefact which could be affecting the result. If you zoom in a lot so you can see the individual pixels, you’ll notice that the jaggy borders between colour regions have significant ‘anti-aliasing’, resulting in several pixels of an in-between colour along the borders. This is a standard digital image technique, making jaggy, pixelated lines look smoother. However, in this case, it could be accused of contributing to the perceived illusion effect.

    You’ll note that at the centre of the image, the spirals get so close together that the anti-aliased blends become larger than the spirals themselves, and so most of the pixels of the ‘green’ are very much NOT the same colour as the pixels of the ‘blue’.

    However, I will concede that the bands at the outside are wide enough so that there is significant amounts of same-coloured pixels. So, yeah, after all that, it seems the illusion still ‘works’, and it’s damned good.

    Still, for complete rigour, I wonder if anyone can be bothered rendering a high-resolution version with no anti-aliasing.

  3. This reminds me of an article some 30 years ago in Sci Am about how a b/w slide photo was taken first through a red filter and then a second picture through a blue one. Then with two projectors — first one with a red filter and second one with the blue — the images were aligned. When that happened more than just the red and blue tints were visible — a whole range of color tints were “visible.”

    The same thing must be going on here.

    Nice illusion.

    1. Yes it was in the early 1900’s. Prokudin-Gorskii used this technique. Here is an article about it:

      For more Photoshop fun, you can search the Library of Congress images Web site and find more images, some have been combined, some not. If you’re clever enough, you can composite these yourself in Photoshop and see some amazing images from around 1905 that have never been published in color.

  4. Wow!
    It is one of those illusions that is very hard to believe!
    Thank you Richard for bringing it to my attention.

    (BTW, the actual colour concerned is not ‘solid’.
    It is formed by dithering two pixels at an approximately 50% distribution.
    One pixels is R=11, G=244, B=156.
    The other is R=20, G=250, B=140.)

    I, too, would be interested in viewing a better resolution version of this startling illusion.
    I have done a cursory search, but have to hand back my Sherlock Google badge, as I found nothing…

  5. um. unless this image fools photoshop too, it doesnt work. and if you’re removing color from the blue and green to make them match, its not really an illusion since you’re tampering with the image.

  6. I copied the picture to Photoshop, but did not use the technique described here. I simply used the eyedropper tool, and then the paintbrush. The blue & green are definitely different colors. In the outer edges of the spiral, the colors are more similar, but still distinct. Near the center of the spiral, they are not even close.

    1. Ok, I tried using the same technique using the original image on the buzzhunt website that is linked to here. In that image, the “blue” and the “green” are indeed the same color. Some extra color information was added when the image was copied to this site.

  7. The original (on the other website) is a GIF image with a fixed palette of colours. The colours in the palette are black (0,0,0), orange (255,150,0), purple (255,0,255), and the green-blue (0, 255, 150) colour that appears as two colours to our eyes.

    The image included on this page (colors.gif) has a different palette with many more colours. It is also smaller. I suspect that it got resized, and in the process the software that resized it performed some color mixing and interpolation. It’d probably be better to have the original picture here.

    That said, this is genuinely a baffling optical illusion.

    1. I’ve been playing with this a bit, or rather, with the original. Even if you change the green-blue colour to another one, like pure blue, or red, the illusion still works.

  8. For those of us who don’t want to bother tinkering with photoshop: zooming in seems to diminish the effect somewhat – probably because the bands become much wider and are thus less affected by the surrounding red and orange bands. With maximum zoom in Firefox I can see that the colors in the outer bands are indeed the same. But I can’t keep this in my mind. As soon as I zoom out again, the colors resume looking completely different.

    1. In this version of the picture, does everyone else see the green on the left and the blue on the right? Or are there people who see it the other way around?

    2. When I zoom in on your image (using pixelmator) I find the ‘greener’ side switches from the left to the right at the highest zoom levels. Intriguing.

  9. Well, it is mostly the same color, but if you look at the pixels bordering with the purple, you’ll find the ‘blue’ ones more blue and ‘green’ ones more green than the base ‘blue-green’ color. And if it wasn’t for that, we wouldn’t be able to see one spiral as constantly green, and the other as constantly blue, they would change places depending on zoom or smth.

  10. As pointed out above, the colors are the same (0x00ff96) in the original image. It seems that the image here was changed by the wordpress image tools

  11. Seriously wow! Have to say I find the spiral version more impressive than the squares version. The colour “difference” doesn’t seem as great in the squares version.

  12. Sussed out how this works. Hope it doesn’t detract…

    It’s well known that the human eye detectd differences in colour (chrominance) at a much lower resolution than light levels (luminance). Between two sharply contrasting colours, the eye always does a little bit of averaging at the edges.

    If you zoom in and follow the paths, you’ll see that there are three colours of spiral: a magenta, an orange, and a blue/green. The magenta and orange colours are harmonious enough that we ignore the difference between those and concentrate on the blue/green.

    Where we see blue/green as green, it is averaging with orange; where we see blue/green as blue, it is averaging with magenta. Though the blue/green is always the same colour, it is rendered on alternating paths, and so averages out with a different colour.

    As mentioned above, the illusiion is being ‘helped along’ by anti-aliasing. I would imagine a high-res, non-anti-aliasing version would produce the same effect, though perhaps less prominent, provided the spirals have a small enough width.

    The ‘trick’ is to see the non-blue/green parts as two different colours, magenta and orange. Because of the way our brains prioritise certain contrasts, this is not immediately apparent.

    Cool effect. Thumbs up.

    1. Good job, Joseph. I was hoping someone else was paying close enough attention to see this. Its actually just in the way that original blue green color and the two colored stripes over laying the spirals are seen by the eye.

      Another interesting and sort of similar trick: wrap two copper pipes around each other, then fill one with very warm water, and the other with very cool water. After that, grab the pipes and you will react as if you just scalded your hand.

      The reason why is because the hand, of course, has alot of nerves in it for sensing all kinds of things. Particularly, you have two types of nerves for sensing temperature, one set for hot, the other for cold. When something is on the uncomfortable end of hot or cold it fires both sets of nerves which causes extreeme discomfort, the way a burn feels. SO, the warm and cold pipes fire both types of nerves and you get the same feeling.

      Now, if you will permit me to think a bit. Does it say something about our society when so many people relied more on technology than the obvious explanation?

    2. Yes, the actual colour is more of a cyan (turquoise-ish), rather than either blue or green. The apparent outcome is not so much averaging as contrasting, I would say, but you’re otherwise close enough.

  13. Nicely done,…colours do absorb eachother right, guess that’s why, say red, goes better (or better yet different) with some peoples skintone, then others

  14. Another way to test this, as I did, is to copy it to microsoft paint and use the ‘dropper’ tool. Then draw a thick line with another tool.

    Same colour. MENTAL. Great!!

  15. It’s funny but no matter how hard I tried I still saw two different colours. I’m was not convinced by everyone’s replies – were they really sure it’s the same colour ? I don’t have photo shop and my sceptisism has a habit of increasing in proportion to the popularity of an opinion !

    Mmmm, so………..

    I cut a small square approx 5mm by 5mm in a piece of paper and covered most of the image such that I could isolate the apparently different coloured spirals and that pretty much did it – I could see that without the influence of the surrounding colours the individual ‘apparent’ blues and greens now appear to be the same colour.

    I then noticed that if you track a pink band across the screen it is not continuous – i.e. across one colour it is pink, then in between it is pink, however, as you reach the 2nd colour it stops and is replaced by the band of that next color. So I’m guessing part of the heart of the illusion is relative to the continuity of the spirals.

  16. Hm :-?… is really simple..
    Where you see blue.. that is the dominant color..
    ..There is green with a blue outline.. but.. at first site.. is very cool

  17. Some of the colour in the very middle is the same but where the colour blends it is different, that is what you see. The image, if it was in a higher resolution would not have the same illusion.

  18. Yeah, I just copied it to my hard disk and opened it in Photoshop. Both the green and the blue are 59 Cyan, 0 Magenta, 71 Yellow and 0 Black.

  19. Way cool.

    But I’d love to take this discussion to another level. I’ve just always been curious about something. So if someone out there could explain to me how we ‘see’ the same colours. I mean if I see the colour red and have trained myself to learn that the colour I see is ‘red’ how do I know that my ‘red’ isn’t someone else’s blue, but they call it red? Hope that made sense. My son also asked me the other night whether dogs or cats see better and the best I could do at the time was say that because they are both naturally predators both have to have very good eyesight, although because cats tend to hunt more in the dark, their eyes were better in the dark. He then went on to ask me if they saw in colour or black and white and I said we would look that one up, however it still led to the question. How would they have found that out? Animals can’t ‘tell us’ what colours (if at all) that they are seeing. So how would they test for this? I wouldn’t even know where to research this, so if someone could give me a heads up (before the little guy asks me, that would be terrific). Thanks for your patience all!

    1. There are two ways to know what other animals can see.

      First, you take apart their eyes and see what they are made of. You can also do studies to see how eyes react to different colors, shapes, etc.

      Second (and easier) you train them so that they get a doggy treat when they touch a red disc, and no treat for a (say) white disc. Then do it with red and blue, and see if they can learn – if they can’t, they can’t distinguish between those colors.

      Trying to understand other sensory systems, and what it must be like to have them is very weird. For humans, sight is very important, for rats, touch and smell are much more important, and come first. Cats can see better in the dark, but they are less good at distinguishing detail, and better at distinguishing movement and contrast than we are. Bees can see colors that we can’t see. Hippos rely more on smell, and that their environment changes much more slowly than ours. Horses have oval shaped eyeballs, which means that the ground is in focus at the same time as distant stuff is in focus (like wearing bifocals). And finally rabbits can see almost 360 degrees, but have almost no binocular vision. It’s all very weird.

    2. Read a book on dogs recently that reckoned dogs’ eyesight is not as good as ours, and that they see in shades of green, yellow and grey, though I don’t know how they came to that conclusion.

  20. Cool! I put my hand in front of the screen, then looked through the slits between my fingers, and that got the illusion to disappear (so apparently, it needs a large area of the contrasting colors to work).

    lessequalsmore: I’ve wondered that myself, as well. Afaik, they look at the color-sensitive cells in the eyes, and conclude what colors a given animal can see from those. Of course, that doesn’t quite tell you how the animal experiences them. Also, these experts claim that an octopus sees the world in black and white, which leads me to wonder how it knows what color to mimic with its skin…

  21. Taking this to a more personable level. This illusion is the same illusion we operate under every day with people. We want to think we’re all different, but really we’re all quite the same. We see people as having different tastes, different style preferences, different likes and dislikes. But inside, really, we’re all the same. We all want what we want.

  22. Tested this on my colour-blind son as promised. He could see that there were different colours involved but could not say what they were. In fact when asked to look at the original image he focused in on the centre and said he could see a pattern of stars. On second look I can see these stars too and suspect I was probably too distracted by the colours to notice them at first.

  23. Thanks for sharing. It really blew my mind when I zoomed in on the image and noticed that the spirals – in fact – were the same colour.

  24. haha that’s so cool! even my little brother had never seen this one, and he knows all the optical illusions…nice 🙂

  25. Okay, now bring the image into Photoshop, pick the magic wand tool, turn off the Contiguous check box in settings, and click the orange color. The selection pattern makes the image “move” in a weird kind of way.

    Or maybe I’m just looking too hard at it.

  26. No it’s not the same color, open the Levels editor and remove any RGB color (try firts red and green and left the blue color alone) you will see theres a different amount of blue in each stripe.

  27. I also didn’t believe it. But I don’t have Photoshop, so I saved it, opened it in MS Paint, saved it as 8 bit color, and then used the flood fill tool to make the pink and yellow stripes green. As you fill them in, you can see the blue and green changing and getting closer to one another.

    @Joseph Smith: If that’s not jaw dropping, what is?

  28. you can use paint instead of photoshop. just cut and paste a piece of “green” and a piece of “blue” and put them side by side, it is the same color. and now i have a headache.

  29. Yup – a great illusion. All made possible by the fact that there are around 8 different colors around the blue/green (almost a teal) color that force the eye to create different contrast/interpretations.

    They use this technique in advertising quite a bit. Thanks for the interesting post – Fred/Azratek

    1. Get the original image from the link above. It’s a GIF image with only four colours in the palette, one of which is black, and not used. There are only three colours in this picture, and that’s all that’s needed for the illusion.

  30. I think that is cool. I just want peopel to know, I have an arbitation going on with one boyband, and I am actually the first boy group fan for a huge male vocal group from the 1990’s. Anyways, I think that is cool. I have started a Yahoo! group that is opposed to some of the illegal ways they do business and use illegal interior instagator agents on their websites worldwide. Anyways, that is cool. Keep it up, message me if you want to on here. Thanks. -“D”.

  31. I tried Checking the colors on the broad bands as well as the more narrow ones with gimp and photoshop and the colors are different. Maybe a higher rez picture would demonstrate the illusion better but from what I see these are different colors

  32. Love it! As a painter I’m well aware of how different the same color can look in a different context and have often used it or been undermined by it. This is one of the best examples I’ve seen. Thanks for posting it. Is it copywrited. Can someone use it if necessary?

  33. Not at all unexpected. if you know a bit about the eye and color perception. The phenomenon is known as “simultaneous contrast.” by setting the same color against different backgrounds the eye perceives different colors. Simultaneous contrast identified by Michel Eugène Chevreul refers to the manner in which the colors of two different objects affect each other. See

  34. Opening the original .gif in GIMP, using the eyedropper tool, I get that the ‘blue’ stripes are ff00ff and the green stripes are 00ff96. Is this a psychology experiment?

  35. Heh, why do we have to see the dreaded “I just reply without bothering to read previous replies first” -effect also here? To summarize the facts:

    The (current) image here in Richard’s blog does have lots of antialiasing and lots of different colours. Although the basic illusion still works, the image is not very good for skeptics who actually want to see what is happening there.

    However, the untouched image, which you can find for example here:


    …is a GIF file with an indexed colour palette of exactly 3 colours (actually 4, but one of them is not used in the picture). There are no more than that, and “green” and “blue” are the exact same colour, namely #00FF96. If you see them as different colours, it’s purely due to your eyes deceiving you, and nothing else. If your image processing program claims they are different colours, you are doing it wrong. It’s as simple as that, period, no need for anyone to claim otherwise. I have spoken.

    Amazing illusion, BTW. 🙂

  36. Jmm, interesting, but the “blue” seems a kind of light green when you zoom…I think it’s for all the other colors. Good illusion anyway.

    Sorry for bad english, if there’s any jaja.

  37. This is awesome!
    Stuff like this used to happen to me when i watched the clothes on spin cycle [we had a washer you could lift the lid up on and it would still go].
    You watch and blink your eyes at the same time and it all strobes…

  38. it looks as if theres a pink background and a orange spiral running through.
    whenever the “same common color” overlaps it, the appearance looks blue, and when the spiral runs over the common color, it gives an appearance of green…

  39. All mind-numbing. The orange stripe becomes blue when it hits the “blue” coil. The pink stripe becomes green when it hits the “green” coil. I don’t get it.

  40. Great illusion for sure! I had to really just avoid looking at the pink and the lines to really see that the colors are the same.

  41. Brilliant. It was quite obvious how they did it but I still had to take it to photoshop and check the colour codes. Even enlarged, with the contrasting colours quite clear, my mind still sees the two different colours (though for split-seconds I can see the “green” pop out of the “blue” and vice versa).

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  43. They are definitely not the same colours. Zoom in, look at each band independently. Green is green. Blue is blue. Zoom in further, till you see the basic colour blocks. Again, green is green. Blue is blue. The only illusion in this is to kid people into thinking there is an illusion. There is none.

  44. When I was in art school I was taught “more red is redder than less red.” The small areas of a colour are more muddied by surrounding colours than large expanses of the colour.

    This is a great example of the effect.

    I have posted a link to your site from mine as I think it is so cool. I hope you get a lot of hits.


  45. I don’t know what you mean by the “illusion vanishing” when you zoom in, but if by that you mean that it becomes clearer that the blue and green are, in fact, the same green colour, then I get ya 😉

    That’s an amazing illusion. I will share it with everyone I know.

  46. That’s so cool!! I’ts like magic. I’ve seen things like that in my psychology class and I love it ^o^

  47. Well, I copied the image on to MS paint and used invert colors option and the green took a diff color and blue took a diff one. I dont know how you say they are the same 🙂

  48. Color is never absolute…our perception can be dramatically affected by proportion, value/intensity, lighting, surrounding colors, etc.

    This particular change in perception is a form of simultaneous contrast and is intensified by the proportional relationships between the colors…this is why the illusion dissipates when you zoom into the image. I always give this assignment in my color theory courses. The other version is to make two different colors look the same (again by the choice of surrounding colors).

    For those of you who are amazed by this, check out the color theory workbook exercises by Albers and Itten…

  49. This does not look like an optical illusion. It is something that might make me puke if I keep looking at it. YIKES.

  50. This is a great illusion, as evidenced by all the people posting trying to prove it wrong or acceptance there of. Yes I have photoshop too so I had to see for myself. People, the mind creates a color shift because of the color it is next to. Its like mixing paint colors as a kid. When you have certain colors juxtaposed together, your eye (mind) blends them. Thanks for your post!

  51. Where the color looks green it is layered on top of the orangish stripes and where it looks blue it is layered on top of the pink. I assume that’s why you get the different hues from one color, or am I missing something?

  52. thank you for this nice post. i had to look at the screen closer, almost cross-eyed, and i’ve got a headache but still amused

  53. Here is the key to find out the real colors of the blue or green bands (not the pink and orange). View the image separately by rt clicking on it and choose view image. Then simply zoom in as much as you can by selecting view on the browser tool bar and then clicking zoom repetitively. Now that you have it enlarged as much as possible, look at the color bands individually near the outer most edges of the screen and you will see, that because of the way it was printed with the pink and orange, the bands looked blue and green to the eye before, when in fact they are only green and not blue at all when enlarged.

  54. The pixels in the bands that appear blue are indeed the same colour as the pixels in the bands that appear green. However, I don’t find this particularly amazing. After all, using multiple small areas of colour in close proximity to each other to give the illusion of full colour is exactly what colour televisions have been doing for years…

  55. I copied this to an an image viewer. I zoomed in as close as possible until all I saw were little boxes of color and I checked the numbers on the colors.

    Here are the numbers for the “teal” color that “looks” blue.
    131 Red
    124 Green
    204 blue

    163 Hue
    105 Sat
    154 Lum

    Here are the numbers for the “teal” color that “looks” green.

    108 Red
    197 Green
    108 blue

    80 Hue
    104 Sat
    144 Lum

    Here are the numbers for the “teal” color that “looks” teal.

    11 Red
    244 Green
    156 blue

    105 Hue
    219 Sat
    120 Lum

    What you’ll notice is that the green teal actually is green. The blue teal actually is blue. And what looks like teal on the outside edges, is actually teal. But only around the outside ledges. As you move in each spiral, the color from the orange and the purple bleeds into the teal and changes it.

    I wonder what this would look like not on a computer screen, but on the computer screen the colors have been smooshed together. The little tiny pixels really are blue and green. They were supposed to be teal, but the computer smooshed the colors up and so it gives us green and blue. Which is why we see green and blue.

    This isn’t an optical illusion. At most, it’s an amusing failure of the computer to maintain the integrity of an image file.

  56. It’s not weird. It’s just your brain trying to adjust the contrast between the colors right next to the spirals. If you notice, There are also two other colors in the image. one seems to be orange and the other purple. These two colors “cut” each one of the spiral and that is what creates the apparently two different colors. I believe the difference is made by the color cutting the spiral. If the color cutting the spiral is purple, the spiral appear to be blue, otherwise the spiral seems to be green. It’s not wired, but is amazing. Our brain can be “hacked” so easily.

  57. Wow that is amazing, first it looks like the same color, then when you zoom in you see both a green, just where the green is sort of in reverse.

  58. The illusion has to do with haptic perception. When the same color is surrounded by two different colors, relative to itself it appears to be a different color. Basic color theory! Art students at my university do some of their first projects surrounding this idea.

  59. The green is actually 123, 255, 255 (RGB) and the blue is 122, 255, 255; HOWEVER, those colors are identical to the naked eye.

    Great illusion!

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  61. Open it in PS, go to “Enhance”>”Replace Color” and knock the “fuzziness” to about 16-20. Hit the “selection” button then click on either the green or the blue spiral.

    If the colours were the same then you would expect green and blue spirals to both be selected. They are, but at different densities. The same colours are contained in each spiral, but because the density of pixels of a particular shade are different the spirals appear to be different colours. Subtle, but identifiably different.

    1. On further investigation I take back my last comment – this appears to be an artifact of anti-aliasing.

      The difference in colour is an entirely perceived phenomenon, influenced by the adjacent colours.

      Fantastic optical illusion!

  62. Just goes to show you that a color is only as evident as is allowed by nearby colors. Photographers should pay attention to this!

  63. Do you want to see the best optical illusion? Just look at your computer monitor right now. You will see a lot of colors that aren’t actually there, because the monitor only has three kind of pixels: red, green and blue. For example, when you are seeing yellow, you are actually see a bunch of green and blue pixels. Is that an optical illusion or what?

  64. This illusion totally rocks, Dr. Wiseman! If you scroll down to the lower portion of the top image, you’ll notice that the sameness of the apparent green and blue becomes more evident, though even that requires some perceptual gymnastics. Fantastic post! Fnord.

  65. Oops! Sorry, I forgot to mention that most of the upper portion of the image has to be obscured by the top of the browser window in order for this to work.

  66. Hi,

    I just want to say that I’ve looked at this a number of times but all i see is pink and green. However I look at it I can’t see the blue. I’m not colourblind but i do have an inflammatory condition of the iris (Iritis) and suffer migraines so I’m not sure if this is why the illusion does not work for me.

    1. Livi,

      It is possible to acquire colour blindness throughout life as a result of various disorders. A few can cause iritis and can also cause inflammation of the optic nerve, which could result in an acquired color vision defect. This is not something you would necessarily notice if it occurred slowly and was mild (there are various degrees of colour vision defect). I’d get my eyes checked by an optometrist or ophthalmologist to be on the safe side 😉

      Also possible is that the colour fidelity on your monitor is not correct so is not displaying the illusion properly – so don’t rely on websites for the diagnosis.

  67. It is the way two different colors are used! One outlines the other in different ways… very interesting effect! Thank-you!!! 🙂

  68. Oh wowzers!!!

    That’s truly amazing, and jaw dropping as you say. Love it!

    I’m really interested in colour and how we perceive it. And this reminds me of a little thing Derren did in one of his Trick or Treat episodes. It was the one where he taught an old lady to beat international poker players. He went to Las Vegas and did a little piece with a woman who he showed some coloured cards to, she named each colour and then he convinced her that they could infact be different colours and that it was subjective. Then she couldn’t recognise her own car because her perception of colours had been totally skewed.

    Isn’t there a philosophical question about what each person sees when they’re describing the same colour. How can we ever know if we’re really seeing the same thing? Hmmm interesting…

  69. Hey Gary, Jeremy, Anon & Anne,

    Thanks for your feedback about how animals see etc. Gary I tried to log onto that link you left but wouldn’t you know it? Yahoo was…. “We are experiencing some unexpected downtime and are working to fix the problem. We’re sorry for any inconvenience.” So I’ll have to have another gander at that link later on. I’m now about to discuss your feedback with my son. Fascinating subject.


  70. Just open the image in paint and use the eye dropper tool…you’ll see that the 2 swirls are the same colour.

    You don’t even need to use photoshop

  71. I totally get it the bluesh magenta colour mixes with the green while the warmer orange mixes to make the green appear more yellowy, i like



  73. I find it kind of strange how so many people are content with using photoshop/paint/GIMP to check of the colours are the same while completely neglecting to look up why we see them as different colours and how our eyes and brain work.

    1. Not CONTENT, Vin. Just THOROUGH. After all, it’s important to establish for certain that the illusion actually EXISTS before searching for explanations.

  74. this “illusion” is totally retarded. sure, the green is the same in both spirals, but the one that appears blue at a distance DOES have blue in it (blue borders around the green parts, which the other does not). more accurately, the one that appears green has only green and orange in it, and the one that appears blue has only blue, green, and purple in it. so of course from a distance they look different, because they ARE different. lame…

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  76. Very nice, mr. Wiseman! All the more so because I can see it and I am blue-green color blind. It doesn’t change when I zoom in, and neither is the green colour the same in both images. I also had my rethinas lasered for rethinopaty and as a result could not see the colour red for a few years.
    Images like this fascinate me!

  77. Hey very cool website!! Guy .. Beautiful .. Superb .. I will bookmark your website and take the feeds additionally?
    I’m glad to seek out so many useful information here in the publish, we want work out more strategies on this regard, thank you for sharing. . . . . .

  78. We have Josef Albers ‘Interaction of Colour’ to thank for being the seminal work that first explored this phenomenon in detail. Check it out if you like this puzzle.

  79. I just love these. I like to call them brain food, as they always put a smile on my face and make me think harder. But the illusions that really get me are the ones input in a painting or a picture that brings a deeper meaning encrypted inside. Something like these – https://viewkick.com/enigmatic-optical-illusion-paintings-by-rob-gonsalves
    I just love this artist’s work! If you have more like these or know more about it, please share it with me!

  80. The key is the color that is crossing the green, in the case of the blue, the pink lines and the green mix and makes that light blue color and the orange lines and green it makes the other caind of green lime

  81. I would like to print this on paper and cut out holes where the blue/green parts are. Then I could place it over a green background and see the illusion. The cutting would be difficult with the spiral design, but I think the illusion should work with straight bars. Is there a suitable image I could use? Maybe some graphics guru could make one?

  82. I think what you posted was actually very logical.
    But, think about this, suppose you were to write a killer headline?
    I am not suggesting your content is not solid, but what if
    you added a post title that makes people desire more?
    I mean The best optical illusion I have seen all year – Richard
    Wiseman is kinda boring. You might glance at Yahoo’s front page
    and watch how they write news titles to get people to open the links.
    You might add a related video or a pic or two to grab people excited about what you’ve
    got to say. In my opinion, it would make your posts
    a little livelier.

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