An optical illusion showing six woman sitting on a sofa but with only five pairs of legs on show has sparked a debate online after bewildering viewers.
In the picture, five woman are sitting on a couch in an unknown bar, with another woman perched on the wooden arm of the settee.
However, it seems there is a pair of legs missing - as only five can be seen between the six girls.
The image was shared by a perplexed Reddit user hoping to get some answers, with people soon weighing in with their own theories about the missing pair of legs, the Mirror reports.
Some believe the girl on the left has her legs over the next girl to the right, but others are simply convinced the picture "doesn't add up".
One person said: "The first girl is sitting over the second girl’s legs."
And another wrote: "Number one has her legs crossed, no tear in the knee.
“Number two has only one leg visible, the tear is in her knee. Those legs are blending together. (Follow that tear down, there’s a split where there’s a sock on the right and not on the left. Number two has a tear in her knee and a visible white sock).”
Then a third added: "I actually think the first girl has got legs draped over the second girl's legs."
And another added: "Numbers two and three are leaning way over.”
One Reddit user thought they had cracked it, and focussed in on the girl sitting second from the left.
They said: "Her pants are the same colour, and almost blend. You can see the difference where there is a bit of sock/skin showing above the boot."
Meanwhile, a woman left her friends in stitches after sharing a picture she took of a cave - as everyone noticed the same rude optical illusion.
Twitter user Mairead, @Midge1415, thought the cave picture had a special something, with a huge ray of light stretching in from the rocky entrance.
But looking at it a second time, Mairead noticed something rather rude, and posted the image online saying 'tell me it's not just me who see's it'.
Many of her 5,964 followers noticed the same thing, that the sunlight rather looked quite like a penis, and soon droves of people were commenting on the image as it went viral, racking up over 19,000 likes.
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