Optical Illusion: Here are 8 intriguing optical illusions and mind-boggling illustrations

What do you see in these intriguing illusory images including the mind-bending fish or mermaid image?

Optical Illusion: How many 'M's can you see in this mind-boggling

Optical Illusion: Can You Spot The Word In These Wavy Strips? - News18

Amazing optical illusions

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Amazing Optical Illusions (Puzzle Books) : Gianni A. Sarcone

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Award-Winning Optical Illusions and Brain Puzzles

Here Are 10 Mind-Blowing Eye Tricks - xml tutorial