About Sanmon

A sanmon , also called sangedatsumon , is the most important gate of a Japanese Zen Buddhist temple, and is part of the Zen shichidō garan, the group of buildings that forms the heart of a Zen Buddhist temple. It can be often found in temples of other denominations too. Most sanmon are 2- or 3-bay nijūmon, but the name by itself does not imply any specific architecture.
Engaku-ji, a building with old-style katōmado

Japanese Buddhist architectonic solutions

Japanese Buddhist architecture is the architecture of Buddhist temples in Japan, consisting of locally developed variants of architectural styles born in China. After Buddhism arrived the continent via Three Kingdoms of Korea in the 6th century, an effort was initially made to reproduce original buildings as faithfully as possible, but gradually local versions of continental styles were developed both to meet Japanese tastes and to solve problems posed by local weather, which is more .