This paper explores interactivity, and considers what should be done to create a mass market for interactive media. It is suggested that one way to do so is to examine the video game phenomenon, and a model of interactivity is proposed. The model, a "home interactive theater," would involve interaction in the telling of a story, with the interactor given some room for self-expression in the context of interesting events, although no control over changing the end of the story. It is suggested that, in this context, interaction should have more to do with taking part than with making decisions. (EW)