an at least partially moveable motor - vehicle outer skin is already known per se . an actuator formed of a polymer and / or ion - exchanging and / or other material exhibiting various conformations is provided so that the outer skin can be moved . this material is moveable as a result of physical or chemical effects . the novel outer skin of a motor vehicle requires no expensive tools for the production thereof . the flat section of the outer skin of the bodywork of a motor vehicle is made of a flexible material . a flexible material such as material for convertible top covers is easily moveable yet the surface thereof cannot be increased . this material is tensed at least over one part of the rib of the motor vehicle , e . g . over a space frame . at least one mechanically moveable adjusting element is provided beneath or on top of the edge of the section enabling the outer skin to be deformed . the adjusting element is normally connected to the rib of the motor vehicle .