The original first feature of film art is ().

In the ontology of photographic images, Bazin put forward the aesthetic principle that "the aesthetic feature of photography is that it can reveal the truth". He said: "The camera lens has got rid of the old prejudice and removed the mental rust spots that our feelings have covered the object. Only this kind of cold-eyed lens can make the world give me a pure face and attract my attention, thus causing my attachment. " Bazin draws a conclusion from this that the first feature of film art is "documentary feature", which is closer to life and reality than any other art. Bazin's "film is the asymptote of reality" is called the slogan of "realism".