Even a passive face conveys a great deal of information. Social science tells us we see and react to species, gender, color, shape, wrinkles, freckles, hair, decorations (lipstick, mascara), and so on. Plastic surgeons carefully consider the structure of bone, skin, and muscles, while more generally circulation and innervation is also medically vital. As a face comes to life and begins to move, we observe the lips, teeth, and tongue for speech; the gestures of the eyes, head, and hands for dialog; and the flexing of muscles from forehead to neck for emotion. The available range of motions is remarkable. We puff cheeks, pout lips, stick out the tongue, raise an eyebrow, wink, yawn, scratch, and stare. Some actions are brief, some much slower, and some are variable, either consciously or unconsciously.