We often take CG for granted in modern films — everything from sci-fi flicks to action-heavy blockbusters include plenty of computer generated visuals. But in 1964 the process wasn't quite so widespread. In this film from AT&T's archives — charmingly titled A Computer Technique For the Production of Animated Movies — you can see just how CG animations were created decades ago. And the 16-minute film doesn't just explain how the process works, it's also an example: as the introduction explains "this very film was produced entirely by the process which is about to be described."