For one, the idea of capturing photos on a virtual wall is nothing new.

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Or "Virtual Water, " a wall chart which transforms arcane UNESCO data about water usage into a simple explainer about water consumption.

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They were virtual licenses to print money for Wall Street.

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That opens up the possibility of putting virtual objects into the real world, letting you "pick up" a computer-generated 3D architectural model and spin it around in your hand, for instance, or gesture to control a virtual display appearing on an actual wall.

ENGADGET

Trainees see and hear the virtual world from their own point of view, whether peering out from behind a wall or approaching the scene in a helicopter.

ECONOMIST: Monitor