In an era where special effects are common place, it’s startling to go back and see how filmmakers from a different era built fantastical worlds without so much as a pixel. One of the most staggering examples of using practical effects to bring a new and strange world to life remains Fritz Lang’s landmark and iconic “Metropolis.” In 1984, the synth pioneer Giorgio Moroder used his cultural cachet to produce a controversial new version of Lang’s film. Thanks to the powers of the internet and Open Culture, you can now see this cultural oddity for yourself. Because the original intended frame rate for Lang’s film was unknown, one of the most controversial aspects of the Moroder version of “Metropolis” is that its 24 frames-per-second, and that’s even before you factor in the splashes of color replacing the original black-and-white photography, sound effects and many cut scenes. Cinephiles...