The image was first shared on Instagram and appeared to be a long line of girls sitting alongside each other with their heads turned in different directions.

The photo was taken by Swiss photographer Tiziana Vergari and uploaded in 2016. However, years later, people still can’t decide how many girls feature in the photo, reported Express.

There’s a mirror in the image, making it even more difficult to determine the number of people in the photo.

Thousands of social media users have posted comments giving their guesses, which range from two to 14 girls.

People have argued that a series of mirrors makes it seem that there are more people in the picture than there are.

The photo, which has been liked 14,400 times, was originally posted by Ms Vergari as part of an Instagram weekend hashtag project.

The photographer posted the photo with a caption reading: “Same but different”, leading many social media users to conclude there are two sets of twins in the image.

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One Instagram user said: “4 girls. 2 sets of twins. The clue is in the description.”

Another wrote: “There’s four. Look at how the reflections are. If you see their face, the mirror shows the back of their head. If you see the back of the head, the mirror shows the face. The girls just look similar.”

Ms Vergari confirmed there are only two girls in the photo, who are believed to be her daughters.

The mysterious photo that sparked a debate on social media about the number of girls featured in it continues to baffle viewers years after it was first posted on Instagram by Swiss photographer Tiziana Vergari in 2016. The image shows a long line of girls sitting next to each other, with their heads turned in different directions, creating an optical illusion that makes it difficult to determine the actual number of individuals in the photo.

Adding to the confusion is a mirror in the image, which creates the impression that there may be more people present than there actually are. Thousands of social media users have weighed in with their guesses, ranging from two to 14 girls. Some have pointed out that the use of mirrors in the photo may be distorting the perception of the number of individuals in the shot.

The photo, which garnered 14,400 likes, was originally posted by Ms. Vergari as part of an Instagram weekend hashtag project. In the caption, she wrote, “Same but different,” prompting many viewers to speculate that there are two sets of twins in the image. One Instagram user suggested, “4 girls. 2 sets of twins. The clue is in the description,” while another commented, “There’s four. Look at how the reflections are. The girls just look similar.”

After much speculation, Ms. Vergari eventually confirmed that there are only two girls in the photo, believed to be her daughters. The photo serves as a reminder of the power of optical illusions and how they can deceive our perception of reality. Despite the mystery being solved, the image continues to captivate viewers and spark discussions about the tricks our eyes can play on us.