From the mid-1960s, artists like Kwon Young-woo began to push paint, soak canvas, drag pencils, rip paper, and otherwise manipulate the materials of painting in ways that challenged preconceived notions of what it meant to be an ink painter (Asian painter) or oil painter (soyanghwaga), the two categories within which most artists were categorized. In the 1970s and 80, these challenges eventually became the foundation of Dansaekhwa, or Korean monochrome painting, one of the most successful and controversial artistic movements in twentieth-century Korea. Literally meaning "monochrome painting," the works of artists like Ha Chonghyun, Park Seo-bo, Lee Ufan, Yun Hyong Keun, Choi Myoung-young, Kim Guiline and Lee Dong-youb were promoted in Seoul, Tokyo, and Paris. Tansaekhwa grew to be the international face of contemporary Korean art and a cornerstone of contemporary Asian art.