A new and unique type of science lecture hall has been constructed on the Berkeley Campus of the University of California. Known as the “Physical Sciences Lecture Hall” this facility seating 550 students incorporates a large rotating stage and closed-circuit television. The rotating stage 40 ft in diameter has three complete lecture-room fronts, in the form of an equilateral triangle, and each has all laboratory utilities permanently connected to all lecture tables. The stage permits full demonstration lectures to be given every hour of the day. Sixteen TV picture tubes, suspended by hoists from the ceiling, and two vidicon TV cameras, one operated by the instructor and the other by remote control, make all lecture room demonstrations and activities visible to everyone.