Today’s invention is simply a DVD on which is stored a movie of someone in silhouette getting up out of an armchair and periodically walking about.
This is projected onto the inside surface of a curtain in order to act as a deterrent to would-be burglars.
On occasions, the shadowy person disappears off to one side of the window for periods of several minutes at a time.
When the end of this classic of the cinema is reached, a script simply reruns each section between such disappearances -in a random order so as to avoid the repetition being detected.
