Only smart people can notice the mistake in seconds in this picture puzzle IQ test. 

These mind-bending photos demonstrate the interesting complexity of the human brain's perception of visual stimuli,  

which contradict our expectations and illustrate the mind-bending nature of these images. 

The brains of people are engaged by optical illusions, which challenge us to question what we see. 

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Examples of optical illusions include Escher's impossible stairs and ambiguous figures that switch between two interpretations. 

We are able to see distortions, size paradoxes, or illusory movements that contradict 

the rules of physics as a result of the illusions because they take use of the tendency of the brain to form assumptions. 

Researchers who are interested in cognition and perception can benefit greatly from optical illusions because they are not only visually 

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