The Panopticon offers a powerful and compelling metaphor for understanding electronic surveillance. The prison-like society, where invisible observers track our digital footprints, does indeed seem panoptic. Bentham would surely smile wryly if he saw us complying with institutional norms as we use barcoded library books or note telephone callers' IDs before accepting a call. The familiar distinctions between public and private life dissolve as both government and corporation ignore old thresholds and garner personal data of the most mundane and intimate kinds. [This essay is the original text of Chapter Four of David Lyon's The Electronic Eye: The Rise of Surveillance Society (Minneapolis: University of Minnesota Press, 1994): 57-80.]