How can a computer recognize the subtle facial movements we humans use to express how we fell by the emotions,Dr. Paul Eckman, creat a program of FACS(facial action coding system.)Eckman has classified six basic emotion happiness, surprise, anger, disgust, fear, and sadness, in a real face or in the painted of Mona Lisa the different units of software can even indentify mixed emotions as in da Vinci's masterpiece, each expression is compared against a natural face showing no emotions. The Mona Lisa demonstration is really intended to bring a smile to your face, woh can this computres can do that? Imagine a computer that knows when you're happy or sad. In fact, these are the intructions for a face that looks happy. It's all about some differnt masso in your face. They even indicate the differnce between a genuine smile and a forced smile. In the real smile, the zygomatic major muscles that begin at your cheek bones can lift the corners of your mouth. that's instruction #1. Meanwhile muscles called orbicularis oculi pars palpabraeus make crow's feet around your ayes. That's instruction #2. By the way, did making a happy face in this expriment also make you feel slightly happy.