This optical illusion brain challenge requires hawk eyes to discover the number in seconds. 

The subtleties of human vision are exploited by these illusions, 

which frequently rely on the deft manipulation of forms, colors,  

and patterns to produce illusions of depth, movement, or concealed pictures. 

The phenomenon of ambiguous figures, in which our brain oscillates between numerous 

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interpretations of the same visual stimuli, is a well-known sort of optical illusion.  

What we perceive in these illusions does not necessarily correspond to the reality that we are experiencing, 

which results in an experience that is both joyful and, at times, perplexing. 

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