The optical illusion that reveals how dirty your mind is

How dirty is your mind?

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

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.

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?