significantly transformative of the original work Date 15 December 1947 Source https://www.much.go.kr/cooperation/net/kim.do Author KimKooMuseum & Library
checkered grid using a matrix. Reference: Koo, Ilhoe, Kim Youngna, Kim Kyudong, Sangdeok Yoon, Kyungdo Park, Kim Hyunjung, Im Jin A and Park Hyewon : La