A mom has left Reddit users scratching their heads after posting a snap of her daughter "sinking into the ground".

Reddit user MK24ever took to the social media website to share the impressive optical illusion earlier this month that left people at odds with what can be seen.

She posted the baffling picture to Reddit with the caption: "My daughter, where's the rest of her?? Ohh I see, do you?"

An optical illusion. [[imagecaption|| Credit: Reddit / MK24ever]]

The picture features a young girl playing on a driveway... but the bottom half of her body appears to be completely missing.

The confusing snap did not go unnoticed as it already received more than 69,000 upvotes at the time of writing.

Reacting to the baffling snap, one Reddit user simply wrote: "That's a good one."

A second commented explaining that the caption made the illusion all the more confusing, writing: "Part of the reason it's so good is that the title implies that there's a 'rest of her' to be seen, so we're not expecting half of her body to be completely concealed, we're expecting her to blend in."

Reddit comments. [[imagecaption|| Credit: Reddit]]

A fourth Reddit user reacted to the picture with a simple "WTF" before a fifth suggested that the optical illusion is created by the young girl being behind a wall.

Reddit comments. [[imagecaption|| Credit: Reddit]]

Meanwhile, a fifth Reddit user admitted that they had to come to the comments section to work out exactly what was going on in the picture.

Another baffled social media user wrote: "Everyone who saw it just keeps saying 'there's a wall' instead of saying that the entire foreground is like an elevated plateau and she is standing behind it. I kept looking for a wall between the grass and the girl and it was melting my brain."

Reddit comments. [[imagecaption|| Credit: Reddit]]

Another Reddit user went on to explain that the camera angle is also playing a role in creating the illusion.

A Reddit comment. [[imagecaption|| Credit: Reddit / CubanLynx312]]

However, not everyone on the social media website believed that it was the result of the girl standing behind a wall.

One joked: "People are saying there is a wall she is standing behind but I don't see it. I think this poor kid is trapped in some kind of Manhattan project accident."

A Reddit comment. [[imagecaption|| Credit: Reddit]]

All of which ultimately begs the question, what do you think is going on in this optical illusion? Let us know in the comments.

Featured image credit: Alamy / Donisl

Optical illusion of girl 'sinking into ground' leaves social media users baffled