It's been a while since I last brought you an optical illusion, so... where's one where you just have to answer if there are four concentric circles in the image... or not?
It doesn't seem that difficult... until you start following each circle's contours and find out that its shape seems to be constantly changing in a strange way that we can't really figure out.
One more example that reminds us that our eyes (and the way we perceive images) aren't really as accurate as we like to think.
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