The paper discusses briefly kinetic painting systems that have been devised for producing a pictorial composition on a transluscent flat surface that changes with time without resorting to the projection of light through film in a darkened room. The Lumidyne system developed by the author in 1956 is described in detail. Basic principles of its design, together with variations of the system, are given as well as the method of painting used by the author. Examples of several works are shown. The picture produced by the system is considered from the point of view of real motion and of change of transparent colour with time. The need for aesthetic guide lines for the kinetic painter is stressed. The author concludes that the Lumidyne system, after ten years of experience with it, as a practical, controllable and economical artistic medium.