although numerous works from the period bear sesshū's signature, name, or seal, only a few can be securely attributed to him. many are either copies or works by the artist's pupils; and several painters, including hasegawa tōhaku, even used sesshū's name for artistic reasons. artists most influenced by sesshū's approach to painting are referred to as belonging to the "school of sesshū" ("unkoku-rin" school).