53 of the best internet optical illusions around: You won't believe your eyes

Every now and then an image appears online which has people heartily debating its authenticity, arguing about its colour or asking how it came about in the first place.

There are also some amazing pictures that look like one thing but turn out to be something quite different.

We've gathered together a collection of the best from around the 'net - pictures that'll have you scratching your head, questioning your eyesight and generally feeling perplexed by their existence.

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