was in a client meeting today discussing white-noise and pink-noise sound masking for their offices - this increases acoustic privacy by providing a barely-noticeable background hiss which helps to cover conversations and other sounds. the brain tunes it out while retaining the masking effect - you only notice it in the sudden silence when it ceases.
and someone wondered jokingly if it could carry subliminal messages on behalf of the client organisation. and the brand management woman suggested 'orange noise' (the client's brand colour). and i was struck by the idea of 'the woman who sells branded noise' - like something from a william gibson novel. she would become very rich by selling subliminal 'coloured' noises carrying targeted messages for environments such as offices and shops.