Animating the AT-AT Walkers in The Empire Strikes Back
From the official Star Wars YouTube channel: "Dennis Muren looks back on how Industrial Light & Magic animated the AT-AT walkers from The Empire Strikes Back's Battle of Hoth sequence--and the inspiration for the techniques used. Originally, Muren and his team were unsure of how they would bring the AT-ATs to life. The first idea was to build an actual robot that could move by itself, but that was deemed too complicated and costly. Instead, Muren pushed for stop-motion, citing the influence of King Kong and the realization that the staccato look of stop-motion would be appropriate for machines. Models were manipulated a frame at a time, animated in front of painted backgrounds instead of blue screen, with baking soda was used in place of snow."