Wind power in ancient Japan

The "fundamental" information:

"He-gassen is a Japanese art scroll from the Edo period featuring a number of people farting at each other, objects, and animals. The scroll was digitized by the Waseda University Library, and is available in full on the organization’s website." 

Several additional images are viewable at Laughing Squid.  Via an old blogging friend, Curiosités de Titam.