Eventually, thanks to Photoshop, our helpful friends at Reddit and Wired.com , and a bit of searching (I now know more about the Purkinje effect than I ever thought possible), we know it's just a perception mistake thanks to the unusual lighting and background of the picture
What this does is create balance in your overall look

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Think shells, corals, bubbles, and sequins
Step into the spotlight with this Elegant Black Mini Dress, perfect for adding a touch of charm to your spring and summer wardrobe
Evening footwear: strappy metallics, pointed-toe pumps, satin heels, embellished slingbacks