The Ubiquitous Computing Paradigm
Two issues are of crucial importance: location and scale
Location : ubiquitous computers must know where they are
Inch-scale machines: approximate active Post-It notes
Foot-scale machines: like a sheet of paper (or a book or a magazine)
Yard-scale machines: the equivalent of a blackboard or bulletin board
Prototype tabs, pads and boards are just the beginning of ubiquitous computing