Designing a Tumbling Dungeon is proving more difficult than I'd hoped. At least, in balancing how interesting the turned chambers are with the complexity of explaining them. I thought I might put up some chambers piecemeal as they come to me.
The Hall of Four Spheres is first encountered as a hallway with domes in the flour. These domes are made of stone/iron/brass and have inscriptions of astrological signs on them representing four skies: