One thing that has always been acknowledged is Gance's innovations in the techniques of the cinema. As well as his multiscreen ventures with Polyvision, he explored the use of superimposition of images, extreme close-ups, and fast rhythmic editing, and he made the camera mobile in unorthodox ways – hand-held, mounted on wires or a pendulum, or even strapped to a horse. He also made early experiments with the addition of sound to film, and with filming in colour and in 3-D. There were few aspects of film technique that he did not seek to incorporate in his work, and his influence was acknowledged by contemporaries such as Jean Epstein and later by the French New Wave film-makers. In the assessment of Kevin Brownlow, "...with his silent productions, "J'accuse", "La Roue", and "Napoléon", Gance made a fuller use of the medium than anyone before or since".