Ars Electronica 2004 opens in Linz tomorrow, celebrating 25 years of tracking and nurturing the digital revolution, analyzing the social and cultural effects of digital media and communications technologies from critical as well as utopian, artistic and scientific perspectives. Coinciding with conferences, exhibits, performances and parties is the CyberArts exhibition of the 18th Prix Ars Electronica winners. On display will be Ben Rubin and Mark Hansen's Listening Post, Thomas Koner's Banlieue du Vide and many more. Among the festival's highlighted events, Golan Levin and Zachary Lieberman will be performing The Manual Input Sessions, a wonderfully playful audiovisual performance which explores the possibilities of of gestural language in an augmented-reality shadow play.