“Cameras and recording machines not only transcribe experience but alter its quality, giving to much of modern life the character of an enormous echo chamber, a hall of mirrors. . . . Modern life is so mediated by electronic images that we cannot help responding to others as if their actions—and our own—were being recorded and simultaneously transmitted to an unseen audience or stored up for close scrutiny at some later time. . . . The intrusion into everyday life of this all-seeing eye no longer takes us by surprise or catches us with our defenses down. We need no reminder to smile.”