Mold raising - Katao-koshi

…Using a potter's wheel, the centrifugal force of the rotational motion can be used to carve the shape of a vessel from a lump of clay. There are several methods of making pottery without using a potter's wheel: (1) making a depression in the center of a lump of clay with your fingers and gradually thinning the walls around it to form the shape of a vessel (hand kneading); (2) stacking clay strings or flattened clay strips into a ring (washi) or spiral (hogashi) to form the shape of a vessel (himozukuri); and (3) preparing the lower half of an existing pottery, a basket, or a special mold, and pressing the clay against the inside of it to form the shape of a vessel (kataokoshi). When making strings, the pottery is often turned around while it is being made by placing leaves, wickerwork, cloth, boards, etc. under it, or by working on a rotatable platform (rotary table). …

*Some of the terminology that refers to "katakoshi" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…ろくろを使うと，回転運動の遠心力を利用して，粘土塊から器の形を挽（ひ）き出すことができる。ろくろを使わない土器作りには，(1)粘土塊の中央に指でくぼみを作り，しだいに周囲の壁を薄くして器の形に仕上げる〈手捏ね（てづくね）〉，(2)粘土紐，あるいはそれを平らにした粘土帯を環状(輪積み)，螺旋（らせん）状(巻上げ)に積み重ねて器の形を作る〈紐作り〉，(3)既成の土器の下半部や籠あるいは専用の型を用意し，その内側に粘土を押しつけて器の形を作る〈型起し(型作り)〉の方法がある。紐作りでは，木の葉，網代（あじろ），布，板などを下敷にしたり，回転可能な台(回転台)上で作業したりして，製作中の土器の向きを変えることが多い。…

※「型起し」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報