He-Gassen (Japanese: 屁合戦, literally: "Fart competitions"), or Houhi-Gassen (放屁合戦), are titles given to a Japanese art scroll,[1] created during the Edo period (1603–1868) by an unknown artist or several unknown artists[2][3][4] depicting flatulence humor.

He-Gassen is a subject occasionally depicted in Japanese art, first attested at the end of the Heian Period (794–1185). Toba Sōjō (1053–1140), in addition to his famous Scrolls of Frolicking Animals, is also mentioned as having painted scrolls on themes such as "Phallic Contest" and "He-gassen."[5][6]

One scroll in the possession of the Waseda University Library has been digitized.[7] The Waseda University scroll (reproduced in this article) ends (on the far left) with a colophon, stating that this is a 1846 (弘化三丙午) work by "The Fukuyama painter (福山画師) sixty-nine-year-old Airan (六十九歳 相覧)", being a copy of a 1680 (延宝八) original painted by Hishikawa Moronobu. The artist is possibly Murakata Airan (1778–c.1846). The scroll begins the far right, with a scene of men of various ranks (the lacquered black caps indicate court ranks, the others are commoners) spreading the news of the contest, scenes of men passing along the news and carrying baskets of a certain flatulance-inducing foodstuff (taro), and a cooking scene where the food is being prepared and eaten.

https://en.wikipedia.org/wiki/He-gassen