Composite Portrait

I've started an amusing project at work. My coworker and I are creating a composite portrait of some of the kids taking summer class. The thing above is our first test -- there are 11 faces, of which you see a composite of five at a time. At no point do you ever see a single individual's "real" face. They're constantly replacing each other so the thing mutates while you watch it. Sorta cool, sorta creepy depending on the mood you're in.