A baffling optical illusion claiming to show a fish or a mermaid depending on how your brain works has left internet users scratching their heads. The viral puzzle claims to be based on the theory that different parts of the brain carry out different functions, meaning they're more likely to spot a certain animal based on whether their brain is predominantly left or right sided. However several internet users were confused by the drawing, claiming their 'brains were broken' because image looked more like a seal or a donkey.
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