Square/right angles to smoothy roundness.
It is also the exit (from the stove/oven) and the transition from stove to water heater/bench.
Ironically, the exit/flu to the chimney is RIGHT THERE, but the flu gases/heat need to journey through the heater and bench, transferring the heat to the house.
Cob fun done, the core support goes on, the core on that, and then housing it. Onward as it blows hard outside (trumpet/brass fanfare of medium length, bracing volume!!)
DeedleDoodleDaily 