In addition, it is described in many classic works of literature such as 'Makura no soshi' (The Pillow Book), 'Genji Monogatari' (The Tale of Genji) and 'Sarashina Nikki' (Sarashina Diary).
また「枕草子」、「源氏物語」、「更級日記」など多くの古典文学にも登場する。