Extraordinary claims. Ordinary investigations.

Best optical illusion ever (this year)


“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?”

Check the revelation on Richard Wiseman’s blog. Fellow Ricardo Bittencourt, good skeptic that he is, also tested the image on Photoshop and found the colors didn’t appear to be the same, as he found there’s some color dithering (which means the spirals are actually two tones of color). The original image, with solid colors would be much better to confirm the effect.

Meanwhile, we can deal with a crude paint bucket tool and our eyes. The image below strongly suggests the colors are indeed the same, as changing the other colors changes our perception of the “green” and “blue” spirals.


If someone can reproduce this with solid colors, just to be sure, this would surely be the best illusion this year… or in many years.

UPDATE: I have found the image in PNG version, with no color dithering and solid colors. Keep reading.


Praised be TinEye. And this is surely the best illusion in many years. Want to know what’s going on? Perhaps this will help.

UPDATE: The image is originally by Akiyoshi Kitaoka, famous for his other creations. I also made the Flash animation below:

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Posted in Miscelaneous,Science | 5 comments

5 Comments so far

  1. henteaser June 24th, 2009 5:09 pm

    #00FF96 – Best optical illusion ever (this year) | forgetomori…

    #00FF96 – Best optical illusion ever (this year) | forgetomori…

  2. Open the Future June 25th, 2009 2:44 am

    Your Brain Hates You…

    The “blue” and the “green” are identical colors (RGB 0/255/150). Discuss. Yes, they are. Grab this image and test the colors yourself. Here are more. From Phil Plait, the Bad Astronomy blogger, who says: The orange stripes go through the……

  3. sofieloizou (Sofie) June 29th, 2009 1:12 pm

    ok i guess sometimes you can’t always trust what you see with your own eyes. It’s all about context. http://tinyurl.com/lf8yn2

  4. CabinetofWonder (Cabinet of Wonders) July 2nd, 2009 11:42 pm

    Best optical illusion ever (this year) http://tinyurl.com/lf8yn2

  5. Gnosis April 20th, 2010 12:17 am

    ACtually when bordering to the purple, there is blue antialiasing on the border… tho the color inside is the same, there actually is blue color in the border.

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