A Chinese Biographical Dictionary/Chang Tsao
118 Chang Tsao 張璪 or 張藻 (T. 文通) A famous artist of the T'ang dynasty, especially good at trees, rocks, and landscape. He used the worn-out stump of a brush, or his finger, to rub on the ink; and he is said to have been able to handle two of these at the same time, with one depicting the living, with the other the dead branches and leaves. Author of the 繪境言畫要訣.