Woman's mirror selfie creates a mind-boggling optical illusion

There's only one thing the internet loves more than an argument, and that's a good optical illusion.

Look, here's one of a dog. And here's another of some weird lines that will make your head ache if you stare at them too long.

Anyway, today's optical illusion features a simple mirror selfie. On Saturday, Marisol Villanueva from Granada, Spain, shared the following two images on Twitter:

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Did you spot it?

Villanueva is wearing trousers with a vertical stripe down the middle, but at first glance it almost looks like she has two very skinny, cartoon character-style legs.

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Luckily, Villanueva was quick to dispel the mystery.

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That's Twitter for you. One minute you're sharing a quick couple of selfies, the next you're a viral trend.