Nerikomi
Nerikomi (練り込み) is a Japanese ceramic technique in which differently colored clays are layered and kneaded together to create patterns that run through the entire body of a piece.
Rather than surface decoration, the design is formed from the clay itself, so the pattern remains visible even when the piece is cut or shaped.The layered clay is often compared to Kintaro candy, revealing a unique pattern with each cut.
This technique produces subtle variations in color and form, ensuring that no two pieces are exactly alike.