"The intention was to create something that was more like a piece of music or an experimental film than a typical adventure comic book. I wanted to approach Batman from the point of view of the dreamlike, emotional and irrational hemisphere, as a response to the very literal, "realistic" "left brain" treatment of superheroes which was in vogue at the time, in the wake of The Dark Knight Returns, Watchmen and others."
January 1, 1970
https://en.wikiquote.org/wiki/Arkham_Asylum%3A_A_Serious_House_on_Serious_Earth