Before the Middle Ages, potters were nothing but nameless artisans, however, he placed a seal of his name 'Ninsei' to his works to announce that they were his own works.
中世以前の陶工は無名の職人にすぎなかったが、仁清は自分の作品に「仁清」の印を捺し、これが自分の作品であることを宣言した。