The architect Kim Seok-cheol designed the main building of the Onyang Folk Museum to embody the Korean spirit by applying the rules of proportion and balance found in nature. He intended to not only display the beauty of the structure, but to achieve an organic harmony between it and its surroundings. The path starting from the main gate and leading to the entrance of the main building is curved like a yin-yang (taegeuk) symbol. At the end of this inclined road stands the main building of the museum. Its long eaves and upper floor reflect traditional Korean architecture.
In order to avoid an authoritarian impression, the exterior of the main building is surfaced in brick. The color of the bricks and their style of layering are modeled after the interior of the Tomb of King Munyeong of the Baekje Kingdom in Songsan-ri, Gongju.
The Gujeong Art Center, which takes its name from the pseudonym of its founder, is a monumental example of architecture that reflects Korean sentiments and culture. The Onyang Art Museum (now the Gujeong Art Center) opened with a wish to breathe life and warmth into wood, soil, rock, and wind. Designed in 1982, it was the first building in Korea by the Korean-Japanese architect Itami Jun (Yu Dong-ryong in Korean).
The roof of the building resembles a Geobukseon (Turtle Ship) as a homage to Chungmugong Admiral Yi Sun-sin. Its inner structure is modeled on the rectangular structure of a house common in Chungcheong-do Province, and the walls are built using the stones abundant in the Asan region.