David "Zeb" Cook developed Planescape when he was assigned to create "a complete campaign world (not just a place to visit), survivable by low-level characters, as compatible with the old "Manual of the Planes" as possible, filled with a feeling of vastness without overwhelming the referee, distinct from all other TSR campaigns, free of the words "demon" and "devil" and explainable to Marketing in 25 words or less". For inspiration, Cook listened to Pere Ubu, Philip Glass and "Alexander Nevsky", read "The Dictionary of the Khazars", "Einstein's Dreams", and "The Narrow Road to the Deep North", and for fun at "Bad Movie Nights", watched such films as "Naked Lunch" and "Wolf Devil Woman".