So the PC's descend a wooden staircase and find themselves in the basement level of the tavern. The room is circular with a 50ft diameter, and descends steeply towards the pit, 20ft diameter, which is located in the center of the room. At this point my brain refused to function. I want to describe how large stone slabs, which give the spectators places to sit, descend incrementally, sort of. You know how in amphitheater's usually have perhaps a dozen rings of stone blocks that descend, forming seats for the spectators. Can anyone come up with an eloquent way of describing this?