In the center of the middle deck bisecting all three floors there is a large circular arena glowing brightly under a wide, flat overhead light. Gleaming white with a slow steady pulse of energy vibrating off the pale walls and the faint chirp of electronics lining the walls is oddly trance-like. If one goes looking they'll find the walls are false, hollow, however there is no conceivable way to open them as there appear to be no triggers, no handles, no levers.
