Whether it originates from statistical tabulation or remote sensors, whether it flows in real time or out of recombinant databases, whether it serves the needs of private individuals, globe-spanning corporations or government agencies, information visualization is the operative technology of the networked age, a language of vision for the control society. Infoviz proliferates on the screens of factory workstations, financial trading floors, military commands and surveillance watchspots, everywhere that decisive movements are subject to managerial scrutiny.