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To be wise a man must take a look within - to embrace what he's becoming, and to learn from where he's been. If a man attempts all this, then he truly has the heart and soul it takes to be a man.

Hare Krsna Cook Book
Satvik Food
-Srila Prabhupada

Are you crazy or normal?

Answer just one question - which way is the mask rotating?

Correct answer - right.

People with schizophrenia, however, aren’t fooled by this illusion. If you show them a hollow mask, they tend to see it for what it is – a hollow mask.

A 2009 study came up with dramatic results on just differently people with and without schizophrenia perceive this illusion. The 16 participants without schizophrenia mistook 99 percent of the hollow faces they saw as convex faces, but the 13 schizophrenia patients perceived the hollow faces as convex only 6 percent of the time.

The study also suggested a possible explanation: it may be that people with schizophrenia experience differences in brain connectivity that lead them to process things in a more “bottom-up” way – whereas people without schizophrenia process things in a more “top-down” way, which leads them to conclude based on previous experience that seeing a hollow face is unlikely.