This paper describes Ozone, a new media choreography system based on layered, continuous physical models, designed for building a diverse range of interactive spaces that coordinate arbitrary streams of video and audio synthesized in real-time response to continuous, concurrent activity by people in a live event. We aim to build rich responsive spaces that sustain the free improvisation of collectively or individually meaningful non-linguistic gesture. Ozone provides an expressive way to compose the potential "landscape" of an event evolving according to the designer's intent as well as contingent activity. A potential-energy engine evolves superposed states over simplicial complexes modeling the topological space of metaphorical states.