Kanemaki Jisai and Sasaki Kojirō were both a what of respective fields of study?
Sasaki Kojirō Sasaki Kojirō (佐々木 小次郎 , also known as Sasaki Ganryū) (1585? – April 13, 1612), often anglicised to Kojirō Sasaki, was a prominent Japanese swordsman widely considered a master of his craft, born in Fukui Prefecture. He lived during the "Sengoku" and early "Edo" periods and is most remembered for his death while battling Miyamoto Musashi in 1612.
Jiro Yoshihara Jiro Yoshihara (吉原 治良 , Yoshihara Jirō , January 1, 1905 – February 19, 1972) was a Japanese painter. In 1954, along with Shōzō Shimamoto, he co-founded the avant-garde Gutai group in Osaka. He was a businessman and scion of a family that owned a cooking-oil company, along with a group of young, Hanshin-region artists. Yoshihara had taught Western-style painting before becoming Gutai’s leader. Yoshihara wrote the "Gutai Manifesto" in 1956 and was the leader of the so named group of internationally acclaimed avant-garde artists representative of Japan's post-war art world. He worked in surrealist and abstract expressionist painting styles before turning, in his final years, to the repeated depiction of circles reminiscent of "satori," the enlightenment of Zen. This white circle was made by leaving the canvas unpainted while painting the background black. When asked about his circles, Yoshihara said that he could not manage to paint even one circle with satisfaction, an indication of the depths of his pursuit of this form. Indeed, no two of his circles are shaped exactly alike. He was the leader of the Gutai Group until his death in 1972.