A woman posted a photograph on Twitter on Saturday of herself sporting new pants. The reason she posted the photograph was simple – she wanted to show how little she cared about the rule of mixing vertical and horizontal stripes.

Soon the images went viral for different reasons, however, as unbeknownst to her, she'd managed to make a mind-bending optical illusion using only her pants and the floor. 

The image is just of her standing in front of a mirror in a perfectly ordinary manner, but people glancing at it appear to all be thinking the same thing – she has extraordinarily thin legs.

If you look towards the back of the picture you can see the second shoe, hiding behind her front leg. The stripe on her front leg blends in so well with her floor, creating the illusion that she either has two incredibly skinny cartoonish stick-man legs or is the victim of a serious photoshop fail.

She quickly cleared things up, posting a clarification, and even mocking the mistake by adding fake feet to the photo.

Once you've seen that she, in fact, has two legs, it's pretty much impossible to unsee, just like this cigar.

Nevertheless, Twitter users have taken it upon themselves to photoshop shoes onto her two legs, to make it even more convincing.

As optical illusions go we'd rank this as slightly below the blue and black dress, which people pretended that they saw as white and gold, and way above the hands of God appearing in the sky.

Which, spoiler alert, are actually reflected in the windscreen.