Henry Darger was an American artist who is known for his 15,000 page manuscript entitled The Story of the Vivian Girls, in What is known as the Realms of the Unreal, of the Glandeco-Angelinnian War Storm, Caused by the Child Slave Rebellion He worked as a janitor. A short biography: http://en.wikipedia.org/wiki/Henry_Darger





***edit: although, like Boullee, he is hardly an outsider. he's an architecture professor, last i knew.