There are many ubiquitous computings.
Almost twenty years ago, a researcher at the legendary Xerox Palo Alto Research Center wrote an article—a sketch, really—setting forth the outlines of what computing would look like in a post-PC world.
The researcher's name was Mark Weiser, and his thoughts were summarized in a brief burst simply entitled "Ubiquitous Computing #1." In it, as in the series of seminal papers and articles that followed, Weiser developed the idea of an "invisible" computing, a computing that "does not live on a personal device of any sort, but is in the woodwork everywhere."
What Weiser was describing would be nothing ...