Optical Illusion of Figures Hidden in a Black-and-white Swirl Goes Viral

This puzzling optical illusion will put your eyesight to the test.

The image shows a number partly concealed within a striped black and grey circle. Viewers are asked if they see a number and, if so, what number do they see?

The stripes are arranged in uneven spirals, making the number even trickier to work out. 

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