No formal characteristics
Many experimental films use the physical properties of the medium: photosensitivity, grain, color saturation - but this often manifests itself in very different ways. In the reference books about film history, the genre of experimental film often gets a rather cursory treatment. This is in part due to its very diverse scope; it is not a genre that can easily be described in terms of its formal characteristics. Likewise, experimental films are sometimes made in disciplines outside of film, such as science, visual art, or music. When interpreting these films, the usual film-theoretical framework comes up short.