The most obvious use of springs from a historical perspective was when Kubrick was filming the faked Moon landing on a movie set outside London somewhere as a favor to NASA, under extreme pressure to make a “show of force” to the Ruskies that particular day. Springs on the shoes of the actors who played the astronauts, at least one borrowed from the making of 2001 A Space Odyssey just prior, possibly Kier Dullea, made it appear they were walking on a low-gravity lunar surface. Kubrick stated later in an interview he got the idea from watching Roadrunner cartoons. A side note: it was Kubrick’s wife who came up with the line, “One small step for man, one giant step for mankind.”