An interactive table has a display surface on which a physical object is disposed. A camera within the interactive table responds to infrared (IR) light reflected from the physical object enabling a location of the physical object on the display surface to be determined, so that the physical object appear...http://www.google.co.uk/patents/US20050245302?utm_source=gb-gplus-sharePatent US20050245302 - Interaction between objects and a virtual environment display
