13 awesome optical illusions that will mess with your mind

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An optical illusions are visually perceived images that differ from objective reality. In other words, it’s a trick of the eye. Some optical illusions were explained years ago, while others still remain a mystery.

Bright Side found eighteen more illusions for you that will make you question your eyes (find part 1 here). Be careful: some of them can cause nausea and slight disorientation.

Is this cat going up, or down the staircase?

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