The performance „Open Form III“ is created with a framework called „Responsive Space“. The framework allows a flexible way of working with distributed sound and image projections. The system consists of a multichannel speaker-system, 2-3 video projections, a local Wi-Fi network with a connected web server and mobile devices. The audience is invited to log into the local network with their mobile devices. In the browser of the mobile devices, sound and image is generated or streamed. As we experienced in previous projects with live audio streaming and mobile devices, the spatial gesture of music as a musical parameter comes to the fore. In the performances, the audio is streamed with an icecast-server. The visual output is generated with JavaScript in the client’s browser. Shortcomings, like the various time delays of the audio-stream of different mobile devices or the variation of spatial and visual output, lead to interesting artistic effects. The system offers great opportunities to experiment with different spaces and the spatialization of sound and image.