Is a Chinese artist of Tang Dynasy,and he named Daozi Wu. The picture song zi tian wang tu I love it very much.I like the lines in his paintings and starsd imitating them when I was a child.
I have always been particulary fond of his  paintings since I  was a child .Maybe it is because there were many of his works hanging in my home.i think his paintings have a very spiritual feel to them.
 When wu daozi was young,he once painted murals on the walls of a temple without any draft.he sketched the landscape of the three-hundred-mile-long jiangling river in one go ,whith even amazed the temperor. The buddha figures he painted were so life like that believes could not help  but kneel and worship.people called him the Painting Sage because he could pigments to life with the warmth of human hearts. 
Up to now,Whenever I see smooth line I still think of that painting.