in deciding which props and settings would be used, Kubrick paid meticulous attention to detail and tried to collect as much background material as possible, functioning rather like what he described as "a detective". Cinematographer John Alcott, who worked closely with Kubrick on four of his films, and won an Oscar for Best Cinematography on Barry Lyndon, remarked that Kubrick "questions everything", and was involved in the technical aspects of film-making including camera placement, scene composition, choice of lens, and even operating the camera which would usually be left to the cinematographer. Alcott considered Kubrick to be the "nearest thing to genius I've ever worked with, with all the problems of a genius". Among Kubrick's innovations in cinematography are his use of special effects, as in 2001, where he used both slit-scan photography and front-screen projection, which won Kubrick his only Oscar for special effects. Some reviewers have described and illustrated with video clips, Kubrick's use of "one-point perspective", which leads the viewer's eye towards a central vanishing point. The technique relies on creating a complex visual symmetry using parallel lines in a scene which all converge on that single point, leading away from the viewer. Combined with camera motion it could produce an effect that one writer describes as "hypnotic and thrilling". The Shining was among the first half-dozen features to use the then-revolutionary Steadicam (after the 1976 films Bound for Glory, Marathon Man and Rocky). Kubrick used it to its fullest potential, which gave the audience smooth, stabilized, motion-tracking by the camera. Kubrick described Steadicam as being like a "magic carpet", allowing "fast, flowing, camera movements" in the maze in The Shining which otherwise would have been impossible. Kubrick was among the first directors to use video assist during filming. At the time he began using it in 1966, it was considered cutting-edge technology, requiring him to build his own system. Having it in place during the filming of 2001, he was able to view a video of a take immediately after it was filmed. On some films, such as Barry Lyndon, he used custom made zoom lenses, which allowed him to start a scene with a close-up and slowly zoom out to capture the full panorama of scenery and to film long takes under changing outdoor lighting conditions by making aperture adjustments while the cameras rolled. LoBrutto notes that Kubrick's technical knowledge about lenses "dazzled the manufacturer's