How dirty is your mind?

Thanks to this optical illusion doing the rounds, there's an easy way to tell.

Which did you see? Photo / Supplied
Which did you see? Photo / Supplied

The more worldly among us will see a naked couple engaged in an erotic embrace but children and other innocent-minded individuals will see dolphins - nine of them.

The incredible work, by artist Sandro del PreteWorld, is titled "Message d'Amour des Dauphins" and one of many optical illusions featured on his website Impossible World.

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According to scientists, the brain is able to see two images almost simultaneously when it receives equally plausible visual information.

Which image you see first depends on your experience; the brain will use a short code to convert the information into a picture that you recognise.

Children are more likely to see the dolphins first because they have generally seen less naked bodies than adults.

Which did you see first?