Classicly

The Photoplay: A Psychological Study is written by Hugo Münsterberg. Excerpts from the introduction of the book:

It is arbitrary to say where the development of the moving pictures began and it is impossible to foresee where it will lead. What invention marked the beginning? Was it the first device to introduce movement into the pictures on a screen? Or did the development begin with the first photographing of various phases of moving objects?

Or did it start with the first presentation of successive pictures at such a speed that the impression of movement resulted? Or was the birthday of the new art when the experimenters for the first time succeeded in projecting such rapidly passing pictures on a wall? If we think of the moving pictures as a source of entertainment and esthetic enjoyment, we may see the germ in that camera obscura which allowed one glass slide to pass before another and thus showed the railway train on one slide moving over the bridge on the other glass plate.