Raindrops on the window of a moving train. Plan sets a moving object. Metaphor of cinema: the film set in the device records the movement of the world before. In fact, a train is technically a kind of camera. This is not his first goal (which is the movement of people and objects), but it is a function he has. As the primary objective of cinema was not to tell stories, but to keep an accurate track of the real, while also recording its movement.