Sei Shonagon, a representative female writer of the Heian period, used the aesthetic concept of "Ito Kashi" as an expression of beauty in "The Pillow Book." “Ito” means very, and “wokashi” means graceful and tasteful. A multi-curtain that expresses the scenery that Sei Shonagon and Teishi Fujiwara watched from the imperial court, which was sung in the pillow book, and was happy. Haru, Natsu, Aki, and Fuyu are lined up to connect the ridgelines of the mountains in the image of the Heian period.