Digital Ground was among the first books to offer a theory of place for interaction design. For what are now widely recognize practices of locative media, situated technology, and the augmented city, this book became an early standard, and remains widely read. By challenging then-prevalent notions of virtual world-building, dematerialization, and cyberspace, Digital Ground contributed to a paradigm shift toward tangible, embedded, and urban computing. Its argument began from fundamentals of embodiment, activity theory and habitual action; surveyed then-nascent developments in situated technology; outlined a typology of situated technologies; and developed a philosophical stance on space, place, and placelessness for the age of pervasive computing. Digital Ground became a core text for the discipline of interaction design in its relation to the discipline of architecture.