The optical illusion appears to show two grey squares with different shades, but they are actually exactly the same colour.
The Mirror US on MSN
Optical illusion 'breaks brains' as squares appear different but are exactly same shade
An 'unsettling' optical illusion shows two squares which appear to be completely different shades of gray, but are actually identical, leaving people baffled. One said: 'My brain is broken'.
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