Some optical illusions are even more impressive in tattoo form, where they radically change the appearance of the bearer's skin and, for an instant, make us question reality. It almost looks like you could grab the swirling column tattooed on this fellow's arm.

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Paul O'Rourke at Allstar Ink in Limerick, Ireland, is responsible for this impressive bit of ink. I wonder if the client now deals with a lot of people poking at his arm just to make sure it's an illusion.

[via FYeah Tattoos]