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Optical illusions go viral at regular intervals and fascinate users of social media.

Unforgettable how #thedress heated up tempers around the world around six years ago.

Back then, people discussed for weeks whether a dress was blue and black or gold and white.

In 2017, the internet community argued over the color of these strawberries.

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And just recently, some couldn't believe their ears.

They heard either “Green Needle” or “Brainstorm”.

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Now a seemingly completely harmless photo of a wintry landscape is arousing the Internet community.

Terri Babers posted the picture on her Facebook page, where it has already sparked heated discussions.

The American had deleted it in the meantime.

But too late, the photo has already been shared thousands of times on social media and spread around the world.

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You can see a snow-covered forest with a - let's call it a black spot in the middle.

Some users see a man with his back to the camera.

Others think it is a dog running towards them.

What do you think: man or dog?

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Some even find weird things in the photo:

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Or see even more dogs:

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But most of them first recognize a man and when they look at the photo again, they recognize a dog.

The psychological phenomenon of so-called priming is behind the optical illusion - i.e. the subtle influencing of our thoughts.

Specifically, this means: Many first recognize the man because he is explicitly mentioned in the post.

Therefore, the brain assumes that it is about to see a man.

Only on closer inspection does it detach itself from this thought and perceive other things: with the result that we now see the black poodle.

And that is actually shown in the photo.

Bob Marley is the name of the ball of wool that was walking with his mistress Terri in snowy Fairbanks in Alaska and that keeps the internet busy.