Steven Spielberg

The Hollywood director is the brains behind classic films like 'Jaws', 'Jurassic Park' and 'Raiders of the Lost Ark'.

But he is also the brains behind a machine that fixes a movie camera to tracks and rails.

The patent - filed in 2003 - reads: "A switcher track apparatus comprising four switch units having precisely supported turntables at the intersections of the rails of two tracks, with switch sections of the track on the turntables movable into alternate switching positions in alignment with the two tracks and with magnet assemblies for establishing and releasably holding precise alignment."