A system for displaying onto a surface of a vehicle visually sensible patterns which are visible from an exterior of the vehicle, comprising: a display control subsystem, responsive to an operational state of said vehicle; and a display device, operative in response to an input from said display control subsystem,, to display a visually sensible pattern onto said surface, said display device being: a projector mounted inside said vehicle; or a projector phone having cellular telephone communication functionality operative to wirelessly obtain said visually sensible pattern via a cellular telephone network, where said system also comprises cellular telephone communication fuctionality operative to wirelessly obtain said visually sensible pattern via a cellular telephone network; wherein said display control subsystem, controls activation and deactivation of an activatable rear projection film/material, responsive to said operational state of said vehicle, and wherein said surface is: (a) one of an interior surface and an exterior surface of one of a rear windshield and a side window of said vehicle, with said surface being coated with said activatable rear projection film or with said surface being formed with said activatable rear projection material embedded therewithin; or (b) a frame housing said activatable rear projection film which is mounted in close proximity to a rear windshield or a side window of the vehicle. a display control subsystem, responsive to an operational state of said vehicle; and a display device, operative in response to an input from said display control subsystem,, to display a visually sensible pattern onto said surface, said display device being: a projector mounted inside said vehicle; or a projector phone having cellular telephone communication functionality operative to wirelessly obtain said visually sensible pattern via a cellular telephone network, where said system also comprises cellular telephone communication fuctionality operative to wirelessly obtain said visually sensible pattern via a cellular telephone network; a projector mounted inside said vehicle; or a projector phone having cellular telephone communication functionality operative to wirelessly obtain said visually sensible pattern via a cellular telephone network, where said system also comprises cellular telephone communication fuctionality operative to wirelessly obtain said visually sensible pattern via a cellular telephone network; wherein said display control subsystem, controls activation and deactivation of an activatable rear projection film/material, responsive to said operational state of said vehicle, and wherein said surface is: (a) one of an interior surface and an exterior surface of one of a rear windshield and a side window of said vehicle, with said surface being coated with said activatable rear projection film or with said surface being formed with said activatable rear projection material embedded therewithin; or (b) a frame housing said activatable rear projection film which is mounted in close proximity to a rear windshield or a side window of the vehicle. (a) one of an interior surface and an exterior surface of one of a rear windshield and a side window of said vehicle, with said surface being coated with said activatable rear projection film or with said surface being formed with said activatable rear projection material embedded therewithin; or (b) a frame housing said activatable rear projection film which is mounted in close proximity to a rear windshield or a side window of the vehicle.