S a future of ubiquitous digital devices. He imagined a day in the life of a designer named Sal, warning that “extrapolating from today’s rudimentary fragments of embodied virtuality is like trying to predict the publication of Finnegan’s Wake shortly after having inscribed the first clay tablets.” Weiser didn’t predict the Web or wireless projectors, but he got a lot right. An optimist, he overlooked the privacy and security implications of maintaining visible digital trails of where neighbors had walked. Sal relied on paper instruction manuals and produced long documents instead of slide decks, but he saw weather forecasts and news delivered electronically, and a parking garage directed him to a specific empty space (we are getting there). Weiser’s vision inspired many researchers, designers, and developers.