Star Wars Episode V: The Empire Strikes Back Phil Tippett and Jon Berg animate three AT-ATs — the ones in the backgrounds are cutouts. "I do recall a number of different ideas about what the Imperial snow walkers could have been," says Tippett. "At one point they were going to be remote controlled wheeled things and at other times they were going to be like tractor tanks. I think it was (then Effects DP) Dennis Muren who was instrumental in advising George to attempt to do something quasi-animalistic. The rationale was that the artifacts of stop-motion - a mechanical look - would still be okay."

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