The Facial Action Cutting System

paul ekman studies faces, the human face. He's probably studied the face more anany one up unti my work that was published in 78. We didn't really know how many expressions a face could make and there was nothing like a musical notation for the face. So about 30 years ago, he began by examining his own face very closely to see how many muscles are in there. There are roughly 50. Then he spent the next couple of decades trying to figure out how many ways those muscles can combine to form a facial expression. Developed something you all the facial action cutting system,. basically a muscular scoring system that you can apply to photographs, film or real life behavior