Going round in circles?

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I see a spiral, but if you adjust your eyes (like you did for those puzzle pictures) then I see circles.

 
Follow round with your mouse pointer and they are indeed concentric circles, but your brain wants to "see" a spiral for some reason.

 
So what you are really saying is that the appearance of spirals is NOT down to the 10 pints of Guiness I downed earlier? Guinness hic

 
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