Optical illusion: Only sharp eyes can see the butterfly in this bird photo.

Are you familiar with optical illusions? You may recognize them, but that's okay too! Explanation in easy language. 

Optical illusions are simple pictures that deceive our eyes. Either you'll see things or miss them. 

An optical illusion tricks your eyes into seeing things differently.  

Optical illusions test how our brain and eyes form visual impressions. 

Since optical illusion has several benefits, most people practice it regularly to boost their IQ. 

Optical illusions are fun mental tests. 

You'll have to find a butterfly in this photograph. 

The catch: you have five seconds to find the butterfly. 

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