text: It recognizes the muscles in the face and compares them to a neutral face; this is how the system can tell if you are feeling happy or sad. Eckman, the creator of FACS, organized six different emotions for the system to recognize. These feelings are, happiness, surprise, anger, disgust, fear, and sadness. The computer constructs a 3-D model of the face and identifies muscles such as, the orbicularis oris, which tightens your lips to show anger. This action is very similar to what we as humans do every day, except this is much more accurate.