Quote
"As far as is known, the oldest work Muso signed with his pseudonym Bokutotsuso is dated 1334... Muso used this signature until the end of his life, and subtler characteristics or combinations of various factors can serve as clues."

Muso Soseki
Muso Soseki
Musō Soseki was a Rinzai Zen Buddhist monk and teacher, and a calligrapher, poet and garden designer. The most famous monk of his time, he is also known as Musō Kokushi , an honorific conferred on him by Emperor Go-Daigo. His mother was the daughter of Hōjō Masamura (1264–1268), seventh Shikken (regent) of the Kamakura shogunate.
"As far as is known, the oldest work Muso signed with his pseudonym Bokutotsuso is dated 1334... Muso used this signature until the end of his life, and subtler characteristics or combinations of various factors can serve as clues."
"Thus have I rolled my life throughout Inside and out, reclined, upright. What is all this? A beating drum A trumpets blare No more."