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Special effects

The effects expert Eugen Schüfftan created pioneering visual effects for Metropolis. Among the effects used are miniatures of the city, a camera on a swing, and most notably, the Schüfftan process, in which mirrors are used to create the illusion that actors are occupying miniature sets. This new technique was seen again just two years later in Alfred Hitchcock 's film Blackmail (1929).

The Maschinenmensch – the robot built by Rotwang to resurrect his lost love Hel – was created by sculptor Walter Schulze-Mittendorff. A whole-body plaster cast was taken of actress Brigitte Helm, and the costume was then constructed around it. A chance discovery of a sample of "plastic wood" (a pliable substance designed as wood-filler) allowed Schulze-Mittendorff to build a costume that would both appear metallic and allow a small amount of free movement. Helm sustained cuts and bruises while in character as the robot, as the costume was rigid and uncomfortable.