Katsuki is inspired the beauty of the curves to make this art piece like terra or hill. He expressed the mother nature of "Tanba" (place famous for ceramics) with the pattern like layered earth on this surface. This art piece is fired with charcoal and chaff partially next to it to emphasize its austereness. Katsuki cannot do anything except praying for fire while the kiln is finishing the art piece. So, he deliberates how to put the art pieces in the kiln before fire. With flowers, this art piece is completed as terra which holds them.