Since the Kravis Center for the Performing Arts Opened in 1992, hundreds of entertainers have performed there. Other entertainment venues have performers or entertainers as ghosts. Kravis is unique. It has a phantom audience. At least, sometimes on a rare night when there is no performance, clapping, cheering, booing, whistling, and other signs of an audience can be head at odd times by night watchmen and sanitation staff. The origin of these sounds is unknown.