Is this picture in color or is it black and white?

This optical illusion both confused and amused many people!

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Stuart Humphryes, a British artist, shared a fascinating image on Twitter, explaining that it demonstrates "the illusion of the color assimilation grid". Our visual apparatus, in fact, completes the missing information by making us see color even where it is not present. 

In reality, it is therefore a simple black and white photo on which a colored grid has been placed. What do you see? Color or black and white?

Specialists have identified different types of optical illusions, and most of them are caused by phenomena that deceive the eye and therefore do not depend on human physiology. They are perceptual, in that they are generated by the physiology of the eye. For example, images that can be seen by closing the eyes after staring at a very bright and contrasting image. They are cognitive when they are due to the brain's interpretation of images such as impossible figures and paradoxes of perspective.

Just like this black and white/color photography taht quickly went viral. Many amused internet users made an ironic comment on the initiative: "If I had known this before, I wouldn't have bought an overpriced color television, but I would have simply drawn a colored grid on the screen." wrote someone in the comments. At least, this work has been appreciated and intrigued by thousands of people!

But what did you see on the picture?