Efficiency is a complicated concept though with open hearth fireplaces. After completing her chores she falls asleep by the warm chimney hearth. Ashcakes were cornbread cooked directly on hearth coals. Basic oxygen steelmaking eventually replaced the open hearth furnace. The earliest dwellings in Japan used an open fire hearth for cooking. Also known as a "bogie hearth", the car furnace is an extremely large batch furnace. Most cooking probably took place on a small triangular hearth in the kitchen. Normal rice will be cooked in pots at the kitchen hearth. Yeosan Buin becomes Jowangsin, the goddess of the kitchen, hearth, and fire. Each booth has its own individual hearth and fire. Other metaphors include cave, ditch, pit, bag, vessel, door, hearth, oven, and altar. Ducts passed under, behind, and above the fire in the hearth. They told her that the Silkie would clean the hearth and kindle fires for them. In a ritual, a child was initiated from the hearth (the divine fire). That night, the children witness Grace self-flagellating by burning herself on the hearth.