This paper addresses interactive art within the context of participatory culture, mapping current developments towards more open and creative forms of interactivity labelled ‘open interactions’. The size of the elements within an artwork, the ‘interactive granularity’, is stated as key to the creation of open interactions. The metaphor of conversation is used to explore interactivity and suggest future research/practice directions. It is suggested that the potential for interactivity to propagate further creativity relies heavily on the balance of specification for both interactor and system. Furthermore it is stated that truly conversational interactions are inherently open-ended and can result in both positive and negative outcomes by whatever standard.