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When Our Brain Plays Visual Tricks on Us
Why can such a plain image leave us so baffled? The spiral illusion works on a familiar principle of vision: contrast sensitivity. In short, the better you can distinguish between subtle shades of black, white, and gray, the more likely you are to spot every hidden number.
Some people only see three, while others count five, seven, or even more. So, who’s right? Well… everyone! And that’s exactly what makes this illusion so fascinating.
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