Cameras installed in the ceiling can track people (or other things) and the room would react with certain responses depending on the position of a person or object. In a published example, a room followed a person by showing colored circles on the floor.
Called "Interactive Spaces", the software was developed by Google and Rockwell LAB. It is currently available as an initial source release with a 47-page documentation and a final release is planned to be made available sometime in the future. Interactive Spaces is written in Java and can run on any platform that supports the language.