From Make: Japan:
Beatfly is a small illuminating blimp for entertainment. Its light and movement can be controlled via various interfaces such as MIDI controller, iPhone multi-touch interface, Flash interface on a web site, computer keyboard, mobile phones and voice, and music. It flies, filling the space with colorful light, producing diverse styles of performance in the air. Beatfly is based on open source hardware and software technology, and its technical resources themselves including materials, circuit diagram, mechanical diagram, and software programs are also published as open source under the Creative Commons license. Everyone is welcome to explore this technology by themselves. Beatfly is developed by Hideki Yoshimoto and supported by the IPA Exploratory IT Human Resources Project (The Mitoh Youth Program).