RetroClips

Getting Keaton to appear seamlessly inside a rapid series of environments -- a desert, a busy street, a mountain ledge, the open ocean -- required none of the compositing tools that would later make this kind of effect routine; in 1924 it meant surveying each location in advance, chalking Keaton's exact mark, and matching the camera's height, distance, and lens precisely between setups so the cut from one world to the next would land as a jolt instead of an obvious scene change. It's still cited as one of the most technically demanding effects sequences of the silent era, achieved with nothing but a tape measure and exact repetition.