Tofugu posted these curious images from an Edo period (1603 to 1868) Japanese scroll depicting what is called he-gassen or “farting competition.” The images show people happily expelling their gasses at cats, horses and even at each other. Apparently no one is safe from he-gassen.
According to the website Naruhodo, “similar drawings were used to ridicule westerners towards the end of the Edo period, with images depicting the westerners blown away by Japanese farts.”
For whatever reason, Tofugu chose to post censored images (black boxes over the naughty bits) on their site. I went ahead and captured a few choice pics from the scroll (naughty bits included) from the Japanese and Chinese classics at Waseda University Library which you can view there in its entirety.