Viral photo: How many girls are there?

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Yet another confusing, viral photo is taking the Internet by storm.
This time, however, it doesn’t involve a dress and weird lighting – it involves an unspecified amount of girls and a weird photo angle.
Oh, and some mirrors to make it even more confusing.

Same but different | My entry #whpidentity for @instagram [thank you #instagram for this featuring ??]

A photo posted by tiziana vergari ?iPhoneography (@tizzia) on

Swiss photographer uploaded the photo to Instagram, asking followers to guess how many girls are pictured.
While many guessed that it shows two girls looking in two mirrors on either side, others speculated the picture shows two sets of twins.
“Maybe I could be wrong but, I think is ; 4 people, two Pairs of possibly twins with a juxtaposition of their image reflexion's on a mirror,” one Instagram user wrote.
The photo has since received more than 16,000 likes and 2,000 comments from guessers. 
What do you think?