Study on structure and design of the octagonal Buddhist pagodas, octagonal Buddhist buildings in East Asia of the ancient times and the Middle Ages

我收集了在日本、中国、朝鲜、朝鲜遗留下来的八角形寺庙建筑遗址遗迹以及中国和日本现存的八角形寺庙建筑。现存建筑按木结构形式分为两种风格。一种是日本的安乐寺八角形三层塔，另一种是中国的应县木塔。一般认为，小规模的塔，如古代高丽的遗迹，被划分为安乐寺风格，而大规模的塔，如日本的Hossyoji寺庙遗址，被划分为迎神风格。另外，我认为八边形的塔可以按照一边的长度来设计。这是因为八角形塔身的一边长度与同时期的方形塔身相似。

I collected the remains of octagonal temple building sites left in Japan, China, Korea, North Korea and the octagonal temple buildings which existed in China and Japan. Existed buildings are divided into 2 styles by the forms of wooden structuer. One is a style of Anrakuji octagonal three-stories pagoda in Japan, another is a style of wooden pagoda at Ying-shen in China. It is thought that the small scale pagodas, like remains of ancient Kokuryo, are divided to Anrakuji style, and the big scale pagodas, like remains of Hossyoji temple sites in Japan, are divided to Ying-shen styles. In addition, I think that the octagonal pagodas may be designed on the basis of a one side length. It is because the one side length of the octagonal pagoda body is similar to that of square pagoda body of the same period.