The tantalyzing fly

This 1919 animated cartoon by Max Fleisher shows many aspects of the motion of a fly. The Public Domain Review explains (basing its explanation on that in Wikipedia):

Max Fleischer (1883–1972) was a pioneer in the development of the animated cartoon and served as the head of Fleischer Studios. He brought such animated characters as Betty Boop, Koko the Clown, Popeye, and Superman to the movie screen and was responsible for a number of technological innovations. One of these was the Rotoscope, a technique in which animators trace over live-action film movement frame by frame. The technique was used to create his “Out of the Inkwell” series for Bray Studios.

BONUS: Ganson’s mechanical buzzing fly