A city installs a network of sensors, cameras, and data systems that monitor traffic flow, air quality, noise levels, and pedestrian movement in real time, the control center displaying dashboards that make the urban environment legible in ways it never was before, algorithms detecting anomalies that might indicate accidents, crimes, or infrastructure failures, the vision of a city that can see itself and respond to what it sees seeming finally within reach, until a privacy advocate points out that the same infrastructure that monitors traffic also monitors people, that data collected for s