Why does such a simple picture cause so much confusion? The answer lies in something called contrast sensitivity.
Our eyes don’t just see shapes and colors. They constantly compare light and dark, shadows and brightness, in order to form an image our brain can understand. The spiral illusion takes advantage of that process. By layering shades of black and gray in just the right way, it creates an effect that tricks our vision.
The numbers are all there, but whether you notice them depends on a few surprising factors.
Why We All See Something Different
Think of it like this: two people can stand in front of the same painting, and each might notice different details. The same thing happens with this illusion. What you see depends on:
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