If you see a mask that is both solid and hollow in the above illusion, you can breathe a sigh of relief because your brain is well.
On the other hand, if you see only a hollow mask, things might be more complicated.
Doctors remarked that the test subjects that saw a concave mask also showed symptoms of schizophrenia.
But don't panic if you only see a hollow mask because it could also mean that you are a genius!
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