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The facial mask stimulus. (a) Front view of the painted concave surface... | Download Scientific Diagram
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The hollow mask illusion. The masks on the left are normal (convex)... | Download Scientific Diagram
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Mind-boggling mask optical illusion tricks you into thinking you're always looking at the front as it rotates | The Sun
Charlie Chaplin Optical Illusion: Patients With Schizophrenia Do Not Perceive the Hollow-Mask - video Dailymotion
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Optical illusion of a 'hollow mask' reveals shocking truths about the way your brain is wired - what do you see? | The US Sun
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