A number is hidden in this optical illusion — and not everyone noticed it the same way

A simple image becomes viral, internet users racking their brains (or changing their glasses!), and a divisive question: “What number do you see?” If you’ve recently come across this famous black and gray spiral on social media, you’ve probably also tried to discover its secret. But be careful, this visual game conceals much more than meets the eye…

When our brain plays tricks on us (visually!)

Why does such a banal image suddenly leave us so confused? The spiral illusion works by playing on a well-known principle of our vision: contrast sensitivity. Simply put, the more appropriate you are at characteristic the subtle between black, white, and gray, the more likely you are to notice all the hidden numbers.

Some people only see three, others count five, seven, or even a few more. So, who’s right? Well… everyone! And that’s precisely what makes this illusion so appealing.

Figures that vary relying on… you!

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