Our faces play essential roles in defining us as individuals. They are the most immediately identifiable parts of our bodies. We use our faces to communicate emotions and to interact socially. Sometimes, despite our intentions, our faces reveal our thoughts even when we do not speak. In several medical conditions, the facial aspect confirms diagnosis, and while surgical alteration of craniofacial anomalies can do much to normalize appearance, patients are always confronted with the question of what is normal, and with the fact that beauty itself may be nothing more than a culturally...