HIGAVI (acronym for Hybrid Interactive-Generative Audiovisual Instrument) is an installation combining music, visuals, and interactive electronics. The installation is designed to be continuously changing, while also requiring the audience’s participation. As participants walk across a series of invisible infrared beams, animations and music are generated in real-time. Melodies can be created by one or more people, while the computer composes accompanying soundscapes. Each time the piece is played, it is programmed to be ephemeral and never repeated the same way twice. Max is used to read incoming data from infrared sensors that are connected to an Arduino, and turns that data into musical tones. It also sends OSC messages to Processing to create the visuals, as well as receives OSC messages from events in Processing to trigger additional musical data.