A colorful dougong supporting a structure at Sagami Temple, Kasai, Hyōgo, Japan. Dougong is a structural element of interlocking wooden brackets, one of the most important elements in traditional Chinese, Japanese, and Korean architecture. The use of dougong first appeared in buildings of the late centuries BC and evolved into a structural network that joined pillars and columns to the frame of the roof. The pieces are fit together by joinery alone without glue or fasteners, due to the precision and quality of the carpentry.Photo credit: 663highland