Any interaction (e.g. pressure) between bodies or different parts of one body does not take place immediately. There is always a delay during transfer of a disturbance. The length of the disturbance depends on body stiffness. Thus, varying delay, combining in one body stiff, soft, and elastic parts we can create absolutely different forms. Big progress here have been made by street dancers of popping, waving, and robot styles.
Utter case of a weak linkage is a lack of it. Removing linkages and forces breaks up the body. Doing so we can make real rock slides. Human ruins bear deep connotation and exert strong emotional effect.