Modern audio invariably seems to involve amplification in some way, which sets the protagonists apart from e.g. the acousticians who built the ancient Greek theaters, in which vases were built into the walls as passive resonators to improve distinctness of dialogue. The film industry involved audio persons in the sound recording on the set and in the reproduction in film theaters. The Audio Engineering Society was a much younger association than the well-established Society for Motion Picture Engineers, yet the specialization was good for the development of the audio field. Audio developed from a nascent craft into a fully realized professional field; complete with theory and hands-on experience. In 1954, the focus of Audio Engineering shifted from essentially hardware and technical principles to including much more editorial matter on recorded content, and the title of the magazine changed to Audio.