From the brilliant programme Test Yoir Brain on Natural Geographic Channel
This illusion blows my mind look at the two grey squares above which is a darker shade of gray?
Now look really closely which one is darker?
Would you believe me if i said they were both the same colour?
Place your finger inbetween the squares ! (where they meet)
You should see by magic that they are the same colour its so cool.
Check the programme out for the explaination.
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