Most of the computers that participate in embodied virtuality will be invisible in fact as well as in metaphor.

Mark Weiser : scientist
"Already computers in light switches, thermostats, stereos and ovens help to activate the world. These machines and more will be interconnected in a ubiquitous network. As computer scientists, however, my colleagues and I have focused on devices that transmit and display information more directly. We have found two issues of crucial importance: location and scale. Little is more basic to human perception than physical juxtaposition, and so ubiquitous computers must know where they are. (Today's computers, in contrast, have no idea of their location and surroundings.) If a computer merely knows what room it is in, it can adapt its behavior in significant ways without requiring even a hint of artificial intelligence."
The concept of 'ubiquitous computing', or the integration of computing devices into everyday objects of daily human life, was first described by Mark Weiser. In his words, "The most profound technologies are those that disappear. They weave themselves into the fabric of everyday life until they are indistinguishable from it." The reality of this notion can be seen in cell phones, iPods, GPS devices, Google glasses etc today.

Mark Weiser. "The Computer for the 21st Century" Scientific American Special Issue on Communications, Computers, and Networks, Sep 1991.