The internet is stumped once again.
The internet is once again stumped with a mind-bending photo: just how many girls does it show?
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Photographer Tiziana Vergari from Switzerland uploaded the image on Instagram a week ago and it's since gone viral.
"It looks like there's 13 people," one commenter wrote.
"I think I stared at this pic for 5 minutes," another wrote.
Vergari's photo, featured also on @Instagram's feed, is just another one of the many puzzling photos that people just can't seem to figure out.
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Remember trying to figure out whether the dress was really blue and black, or white and gold?
Or searching for the hidden panda in the sea of snowmen?
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