Countless optical illusions are available on the internet, each made to test the sharpness of your observation and perception ...
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Optical illusion: Only those with sharp vision can spot a dog hiding in this herd of cows within 30 seconds
The challenge is to spot the dog in a herd of cows within less than 30 seconds. Sounds easy, but this puzzle is not as easy as it appears. In fact, only one percent of people can spot the dog within ...
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