What is trick photography?

Trick photography was invented by the famous French movie master May Li Ai.

Since the birth of the film, May Li Ai has fallen madly in love with film photography. /kloc-one day in 0/898, he was filming in a street in Paris. While he was photographing a moving bus, the camera suddenly broke down. Just then, a hearse came from a distance. Mei Li Ai didn't notice the arrival of the hearse, so he just solved the problem quickly and continued filming immediately. However, when showing this film, I found a series of strange shots-the driving bus suddenly turned into a hearse. May Li Ai got inspiration from this accidental discovery. So he began to study the modification of the camera. After repeated experiments, he finally invented "repeated photography", that is, one image is superimposed on another, which is the predecessor of the current "multiple exposure photography". Later, Mei also created trick photography such as "Variable Speed Photography".