Optical Illusion – and an understanding

I have always been intrigued by optical illusions.   Each time I find something new I imagespend a lot of time trying to understand what makes it work.   Arthur Shapiro has come up with a new illusion that also shows how our eyes and brain perceive light.  What I really enjoyed about this write-up is the ability to tweak the illusion to see how changes affect what you see.  Check it out here:


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