The 'untranslatable' aspects of materiality might be inscribed within and against significatory modes as a destabilising form of turbulence. This particular relationship between materiality and meaning is demonstrated by the films and videos of John Smith, Scott Rankin, Anthea Kennedy and Nick Burton. Their work in a variety of ways presents a direct critical engagement with processes of signification, albeit by means of their destabilisation. Smith's work with sound in Om and The Black Tower centres on polysemy, shifts in meaning, the attribution of meaning and the deferral of meaning, in which 'meaning' is equivalent to the perceived or represented source of a sound. In this way Smith's work engages directly in a destabilisation of the model of sound-image relations that informs much of classical film practice.