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Animation re-enactment of how the clock sequence was shot in “Safety Last” (1923), using a platform, prop clock face and set facade on top of the actual building located at 908 S. Broadway, in downtown Los Angeles.  There was a mattress below, but as you can see, no guard rails. The building is 9 stories high and is still extant today.

Screen stills from “Locations and Effects” documentary clip included in the Criterion release of “Safety Last” (1923)