I use two addons in this project. One is the FaceTracker to track people’s face and the other one is Box2d which is a physical engine to make a real world. I use the face tracker to get the people’s expression change. If the mouth becomes bigger, it will produce many circles. And it will fall down like in real world. And if the eye moves, the rect will be produced and fall down. At last the window will be filled with different colored shapes. Maybe it can be some beautiful pics.

Here’s the code link:https://github.com/doukooo/textrain