His activities in Itsuura were based on 'the Painting section of the Nihon Bijitsuin' (Japan Art Institute), which consisted of the five members, Tenshin, Taikan, Shunso, Kanzan and Buzan.
五浦での活動、つまり「日本美術院絵画部」は、天心、大観、春草、観山、武山の五名。