The Hidden Worlds of Noise and Voice (2002: Golan Levin and Zachary Lieberman with the production of Ars Electronica Futurelab) is an interactive audiovisual installation whose central theme is the magical relationship of speech to the ethereal medium which conveys it. Participants in this exhibit are able to "see" each others' voices, made visible in the form of animated graphic figurations that appear to emerge from the participants' mouths. In the Hidden Worlds installation, users wear special see-through glasses, which register and superimpose 3D graphics into the real world; when one of the users speaks, colorful abstract forms appear to emerge from his or her mouth. The shapes and movements of these forms are tightly coupled to the unique qualities of the timbres and phonemes sung or spoken by the user, thus enabling a wide range of audiovisual play. The graphics constitute a consensual hallucination which is shared by all of the participants.

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