1. A method for providing graphical input signals from an input device for an interactive computer system using an opaque enclosure with multiple semi-transparent light-diffusing panels disposed to form outside surfaces of the enclosure and an imaging device mounted relative to the panels for imaging the panels, the method including the steps of: touching an outside surface of one panel; imaging an inner surface of the panels with the imaging device; acquiring a background image of the panels before touching the one panel; p1 normalizing the image signal in response to the background image; providing an image signal in response to the image; determining the coordinates of the image of the touch on the panel; and providing signals responsive to the coordinates to the interactive computer system.