In wool sci - fi novels, wool can often represent a connection to a more primitive or natural past. For example, in 'Wool', the wool might be used in the clothing of the characters, symbolizing a link to a time before the post - apocalyptic situation they are in.
Well, the 'Silo Graphic Novel' could be about a post - apocalyptic world where the silo is a refuge for humanity. The graphic novel may depict the struggles of the people living there. There could be power struggles, the search for resources, and attempts to maintain order. The art in the graphic novel would probably play a big role in showing the claustrophobic and yet self - contained world of the silo.
The appeal of a wool story could lie in its potential to evoke a sense of tradition and craftsmanship. Maybe it involves the process of making something with wool or the history behind it.