text: Third,Mona Lisa's Demonstration really intended to bring a smile on your face, For example: if you smile when a Web ad appears on your screen a similar ad will follow but if your frown the next ad will be different,which makes the classroom computer recognize when a student is becoming confused or bored then it could modify the lesson like an effective human instructor and with the same technology it can be used to make computer-animated faces more expressive for video games or video surgery.