"I'm standing in the center of a store on Fifth Avenue, in Manhattan, looking into a full-length mirror. The store is called Mirror. It sells only mirrors. Actually, only this one type of mirror."
Mirror looks just like any other mirror, until it powers on. Suddenly, my reflection is not alone. It’s joined by an enthusiastic woman in yellow leggings and a yellow sports bra, superimposed on the mirror like a Snapchat filter. She immediately starts telling me to do jumping jacks.