“Animated media has roots in history that stretch as far back in time to when ancient man learned to illustrate using even the most primitive tools. Though they probably didn’t create what we would consider to be animations or ‘illustrations-in-motion,’ they did try and portray remembered moments from past hunts, future quests, or encounters with deities.” …

http://pixaranimation.blogspot.com/2005/08/oryx-interview.html