Final answer:
The expression Seishu refers to a Japanese term used to describe a style of traditional painting called Nihonga.
Step-by-step explanation:
Nihonsuh is not a known Japanese expression. However, the expression Seishu refers to a Japanese term used to describe a style of traditional painting called Nihonga. Nihonga is a visual art style that emerged in the late 19th century as a response to Western influences and a desire to revive and promote traditional Japanese artistic heritage. Nihonga artists use well-delineated flat areas of translucent or opaque colors, and they often depict Japanese mythological and historical themes, native landscapes, and Buddhist iconography. The Nihonga style is characterized by its use of traditional materials like paper or silk, sumi ink, and mineral and vegetable pigments.