The main piece, a Tamahagane knife, consists of a long process of folding steel. This traditional, ancient technique, also called 'jewel steel', implies removing impurities by stretching and compressing the steel. This technique creates patterns on the blade and contrasts with the other objects.
The salmon knife is a monoblock piece. Standing up, the shape is larger at the bottom to have more contact surface. The sharp part of the handle is related to the joint of the fingers. The curve line is following the blade.