The front of the kiln is called the firebox. This is where most of the wood is stoked for the duration of the firing. Coals pile deep and fuel the temperature inside the kiln. Textures resembling coral growths or burnt rice form on the pots where the piece is buried in coals. Temperature differences will leave rings of subtle color variations recorded like high water markings on the surface of pieces. These firebox pots are often the most dramatic pots from a firing, but so many are damaged and destroyed it is a high risk area.