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This is Not a Spiral

The blue elements in the image above appear to be a arranged in a continuous spiral, but in fact they form a series of concentric circles.  Your brain will argue so strongly for a spiral that you may need to run your mouse cursor around the circles a few times to convince yourself.

Image credit to Akiyoshi Kitaoka 2009. Via Moillusions.

However, what works for me is closing your eyes and leaving them open for just a little bit so that your eyelashes create a shade, and then, you might just be able to see that it's all going in circles really.
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Easiest way to get it to work are things similar to the barely open eyes trick. You basically want something that will partially obstruct your view...if you are far/near sighted you can also take off your glasses/contacts and get it to the range it looks fuzzy...that'll also ruin the illusion and cause you to see it as pure circles much easier.
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Perhaps you should attribute the image's creation to its author. It appears that the Croation website you sourced this from has no interest in that. It is not legal in the United States to induce infringement of a copyright.

If we want creators to continue to make images such as this, perhaps we should get more serious about protecting their ability to maintain a revenue stream.

Lets grow up journalists - check your sources and give credit where it's due.
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