Reverse Kinetics

Reverse Kinetics is basically this:

When you move an object and it is attached to something else, your movement will affect all the system. Like in a chain, when you hold it from the extremity and shake it in the air, it will not move like a rigid object, nor like a simple pendulum, but in fact like some complex and bizarre chain.
In nature nothing have to be calculated. One object affects the other and thats all. But to simulate this behavior is called Reverse Kinetics.

I've been in those researches as a programmer for some time and got some nice results. The first thing I've ever seen that work nice in this aspect is this link (which I've stumbled on today and that's the reason I'm posting this stuff now). I think this was 7 or 8 years ago. Good results can be seen on some examples in this great site too.

To know some maths theories about it, you can see here.