It is believed to be true that Shihohai is a cultural ceremony that came from China and was changed to suit the Japanese culture while retaining various aspects of Chinese culture, since the Way of Yin and Yan originally came from China and has been systematized, including Chinese studies, thinking, magic and rituals.
陰陽道自体が中国の学問、思想、呪術、祭祀等を包括して体系化したものである為、日本に取り入れた中国の諸文化を元に日本流に昇華させた文化行事であると言うのが正確であると思われる。