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The facial mask stimulus. (a) Front view of the painted concave surface... | 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
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The hollow mask illusion. The masks on the left are normal (convex)... | Download Scientific Diagram
![Schizophrenia patients see through illusions: watch now | UCL News - UCL – University College London Schizophrenia patients see through illusions: watch now | UCL News - UCL – University College London](https://www.ucl.ac.uk/news/sites/news/files/styles/large_image/public/danai.jpg?itok=kDKFwAyI)