To clear up the confusion, Vergari herself jumped into the comments section, explaining that the photo shows two sisters, both of whom are looking into mirrors. The girl closest to the camera is gazing into a mirror just out of the frame, which adds to the illusion’s complexity. When you take a closer look, the answer becomes clear: there are indeed just two girls sitting beside each other, between the mirrors.
By matching their facial features and poses with the reflections in the distance, you can see that it’s simply two people. However, some viewers still claimed that the illusion featured dozens of different women or was the result of special effects.