This weekend and next (April 30 & May 1 // May 7 & 8) there will be two different exhibitions of literary virtual reality at Brown University. The exhibitions will employ a room-sized immersive stereo display (Brown’s Cave) and a spatialized sound system (controlled by Max/MSP) to present 10 projects created by writers, musicians, visual artists, and computer scientists. Because shows will be small (6 people) and spread out at 45 minute increments over the course of the day (11am to 5pm), reservations are required. Reservations are made by calling Brown’s David Winton Bell Gallery at 401-863-2932. This show, “Works from the Cave II,” is the sequel to Brown’s Cave exhibition for the 2003 Boston Cyberarts Festival.