SOLVED! The mystery of how Muybridge took all those photos which created an illusion of motion long before motion picture technology even existed. It was pretty complicated stuff, involving a lot of tripwires and cameras set to go off in split-second sequence. Seems to have worked, though the documentary I took this gif from talked a lot about how Muybridge was a bit of a fiddle. He was an Edison figure, more of a personality than a scientist, and certainly a showman who knew how to present his "facts" to best advantage (as did P. T. Barnum). He killed his wife's lover and was acquitted because he convinced everyone he had the husbandly right to blow the man's weiner off. The guy looked half-crazy and never looked you in the eye and may have even had brain damage.