A FOURTH of July optical illusion has left viewers a little confused and sparked debate among social media users.
The illusion, which was shared on Reddit, shows a variation of an American flag.
However, something appears unusual with the flag as the vertical lines look to be slanted.
Additionally the red and white boxes, which make up the flag's stripes, are scattered in a way that could make someone's eyes feel confused.
Reddit user FoxyJnr987 titled the thread: "Flag of United States but it's that weird optical illusion."
The Redditor simply shared the illusion, a digital image of the American flag, but didn't offer more details until another user questioned: "What's the illusion."
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FoxyJnr987 then explained that the flag photo was a "Cafe Wall Illusion."
"I rotated it so it looks like stripes and made the black squares red instead," FoxyJnr987 said.
"The grey lines that are running vertically look sloped when they are actually straight. It looks better when horizontal."
According to Brain Connection, a Cafe Wall Illusion teases the brain to think the lines in the image are not parallel, when in fact they are.
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"It is thought that the café wall illusion functions due to the high contrast in the two different 'bricks.'
"When interpreting images, our brains tend to 'spread' dark zones into light zones, a function known as irradiation; this 'movement' is probably what causes a false warping effect."
Meanwhile, other users didn't see anything wrong with the image.
One person commented: "All the lines in the flag are standing straight, they aren't diagonal."
"Thank you for worsening my eyesight," another wrote.
A third user wrote: "They dont look diagonal to me, is my brain broken?"
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