A plurality of lights are mounted on the face of a board-like member. An electrical conductive contact member is mounted on the face of the board-like member adjacent each of the plurality of lights. Each contact member is electrically coupled to the light it is adjacent to through an electric circuit which causes the light to light up when a positive electrical pulse is received by the contact member. A positive electric probe or stylus member is provided for allowing positive electrical pulses to be applied to selective ones of contact members to light up selective ones of the plurality of lights.
