Optical illusions are images that are created to deceive the mind, appearing to be something other than they are.
They use light, colours and patterns to mislead the brain, leaving the viewer confused and unsure of what they’re actually seeing.
One optical illusion sweeping and dividing the internet is a black and white drawing.
The drawing claims to be able to determine your age, just by what you see in the image.
The image appears to show either a young lady with a fancy hat or an old woman with a headscarf.
Drawn in black and white, the optical illusion immediately appears as a certain image to different people.
According to research from Flinders University in Australia, what you see in the image can actually determine your age.
Researcher Professor Mike Nicholls revealed: “What we found was young people tended to see the young lady in the image, whereas with older people they tended to see the old lady.”
As per the study, 400 people from the US were shown the cartoon, entitled “My Wife and My Mother-In-Law” for one second.
People then answered what they saw, with young people most likely to see the young woman in a hat.
Those surveyed in the study by Flinders University were between 18 and 70, but did not know the survey was about age.
Posted on Twitter by news site ABC Australia, the image divided the internet, with many users questioning the claims the researches made.
One woman wrote: “I’m over 50 and I see the young woman.”
Another added: I can see both women, the old and the young. What does that say about me?
One Twitter user saw someone else altogether, writing: “I see a beautiful woman with a feather in her hair and some sort of head scarf thing over her hair!!!”
Another image that recently swept the internet is a picture of an oddly dressed man, which went viral thanks to the strange scene it depicts.
Posted to Imgur in January 2014 by an unknown user, the image continues to resurface regularly on the forum.
It depicts a tall man with a bushy ginger beard and sideburns covering most of his face.
The man is already an unmissable sight thanks to his highly distinctive and eccentric dress sense.
He is wearing an all purple outfit consisting of baggy harem trousers, a purple T-shirt and a purple top hat.