Special Effects, in motion pictures, cinematic techniques that creates illusions in yhe audience's mind as well as the illusions created using this techniques. Some common examples are the use of real-screen projections, in which previously photographed material is ptojected behind the actors; the filming of miniature objects in such a way that looks life-size; and the use of animation techniques to create realistic scenes, creatures, or objects that can be combined with live action that has been filmed separately. Disaster films, horror movies, and science fiction movies are three genres that often depend on elaborate special effects. Such effects were used dramatically in the star wars and Raiders of the lost Ark series.