text: When this technology was created it was being tested on the "Mona Lisa Smile". They did a good job making and testing it. The FACS breaks down how the function works in the text it says " The facial expression for each emotion are univeral," observes Dr. Huang,"even though individuals often show varying degrees of expression"(like not smiling as broadly)". What this means is that it takes detail by detail from facial expressions and trun them into ways of understanding of how people feel in certain situations.