The images above appear to show a white face and a black face. But a closer inspection shows there's no difference in colour. Both faces are grey, proving that not everything is black and white.
The illusion has nothing to do with colour but luminance. The luminance of the surrounding shade affects our perception, and the shade of the smaller details reinforce the perception of light or dark relative to the background.
Some people still refuse to believe the faces are the same colour despite numerous demonstrations on platforms like TikTok, where people have made videos showing the images being tested with the eyedropper tool in Photoshop.
The illusion demonstrates the power of luminance and how surrounding elements can trick our minds into seeing the subject of an image in different ways.
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