Harris Gallery, New York, followed in 1974. In 1977 he took a trip to London and Paris for pictures of city scenes, and in 1978 visited Spain, Portugal, France and England. In 1979 he held a one-man exhibition at Dobrick Gallery, then undertook his first round the world trip, returning to Taiwan for the first time in 12 years. In 1980 he returned to Taipei again and held an exhibition at Printmakers Art Gallery, including two works of Taipei street scenes. "Paintings by H.N. Han" was published by Artist Magazine in Taipei in 1980. In 1981 his work featured New York people such as "Music of Washington Square", and the works were exhibited at O.K. Harris Gallery in 1982. In 1983 he set up a studio in a country house at Greenwood Lake, N.Y. In 1984 he travelled to Paris, and in 1985 he worked in his Soho and Greenwood Lake studios. China In 1986 he was invited by Lee Shichi, director of Asia World Gallery in Taipei, for a one-man exhibition of recent works on people. He returned to China, and visited the Central Academy of Fine Arts, and re-visited Chungchin. In 1987 he started a series of work on the subject of China such as "Chungchin People", "Beijing Crowds" and "Foreigners in Beijing". He held his first group exhibition in Shanghai, China, "Artists from Shanghai and Taiwan", and visited Souzhou, Woxi, Honzhou and the Zhejiang Academy of Fine Arts. In 1989 he first visited Mount Huang, mostly the area of Beihai and Xihai, taking scenes in photos and video. In 1989 he went to Shanghai on May 4 and observed the Students' Democratic Movement. He returned to New York and painted the "Tiananmem Square" series. In 1990 he exhibited the "Tiananmen Square" and "Mount Huang" series in New York and Taipei. In 1997 he re-visited Mount Huang and continued painting on the subject of Mount Huang. In 2007 he expanded his studio home in Dali, Yunnan, to become a gallery space. Stylistic changes He began with abstract form oil painting, and in 1963 he began working with roller and stencils on rice paper, still abstract, emphasizing form and space structure. He was influenced by pop art from 1966. In 1969 he began spray painting works using acrylic paint on canvas, created the "Invisible Image" series. In 1971, in the process of spray gun painting, found how to create