Although things seem quite predictable and stable when we look at things from a distance, when we look at the physical universe more closely at microscopic levels, things tend to get more chaotic. A bubble will tend to be fairly stable in shape despite the fact that individual air molecules are moving rather chaotically. The random movements of the molecules of air in balloon tend to even out providing fairly stable air pressure so the balloon keeps its shape.
From a distance you don't see the movement of individual molecules but like a TV picture made of pixels things seem smooth if you don't look too closely. Likewise the totally chaotic world looking at the tiniest building block of the material universe may be made of totally random digital events but at the macroscopic level we have predictable laws of a seemingly analog universe.
Similarly over time large objects tend to take on less jagged forms through interactions with other similar objects such as the smoothing of river stones or via alignment of constituent particles as seen in the formations of planets and solar systems.