Focus on Shigaraki ware storage jar (Indianapolis Museum of Art) and analyze the Description.
The clay used to create this jar was mixed with stone fragments and pebbles, resulting in an uneven surface that resembles the natural variations of granite. It was formed by quickly patting down clay coils, for a rough, asymmetrical profile. The glaze was made when ashes from the wood burning in the kiln landed on the vessel and liquified, their varying amounts of iron resulting in the different colors.
granite clay