Optical illusions are a topic we’ve covered numerous times here on the blog, but I’ve noticed a growing trend in the optical-illusion memes that go viral: something to debate.

Think about it. We had The Dress, which the Internet lost its collective mind over. Then we had The Jacket, which upped the ante from two interpretations to four.

Now a friend of the blog has sent me an optical illusion that’s been making the rounds in her group of friends and sparking much debate.

Fellow puzzlers and PuzzleNationers, I give you…How Many Girls?

What’s going on here? Is this a casting call? A family reunion? Are there mirrors involved, or identical twins? Is this a doppelganger convention? Evidence of human cloning?

This image first appeared a few months ago on the Instagram account of Swiss photographer Tiziana Vergari, and although it hasn’t quite reached the fever pitch of The Dress, it’s by far the most viewed image on her account.

So, how many girls do you see?

Last chance before I give you the definitive answer!

Okay then.

According to Vergari, this photo features two sisters, both of whom are looking into mirrors (although one of those mirrors is out of frame).

Honestly, based on the eye placement and angle of the heads for the two I circled, I would’ve said four.

Just goes to show you, you never can tell.

Except for The Dress. That was obviously blue and black. I mean, come on.

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