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The debate then was made into a poll posted by BuzzFeed Community Manager Cates Holderness, where more than 16 million people saw it

This matters because if it was back-lit, it would be in a shadow, otherwise not

As the phenomenon spread, it drew the attention of scientists and psychologists who sought to understand the reasons behind the differing perceptions

Here at Miss Vogue we really can't make our minds up so we put the question to our resident expert Gaby Cove, head of photography at Conde Nast Digital : "We had a really fun few minutes on the Vogue.com picture desk scratching our heads figuring this out