Glimmer, a composition for chamber orchestra and audience, uses novelty light sticks, video cameras, computer software, multi-colored stand lights, and projected video animation to create a continuous feedback loop in which audience activities, software algorithms, and orchestral performance together create the music. This paper establishes the aesthetic background and motivations behind Glimmer and describes the conceptual framework and technical realization of the piece in detail. Performances of the work by the American Composers Orchestra at Carnegie Hall in New York and by musicians at the Hamabada Art Center in Jerusalem are evaluated with respect to the audience, the musicians, and the resulting music that was created.