Entropy

Things go from "less probable" to "more probable". If you put a spoonful of salt and sugar in a box and shake it, they will get mixed into salty sweet powder and never return to their original pure states, no matter how many times more you shake it, because a mixed state is overwhelmingly more probable than the pure state. Things somehow want to go mediocre. Therefore we can say, if things are in a pure or special state, they have a potential power to move to mediocrity. (This you may call entropy increase.) We can use this power.
Let me take "rubber" as an example. Rubber consists of long string-like molecules. The molecule is always moving like a wiggling snake, but mostly they are in a crumpled and tangled shape (so their lengths are short). When you hold both ends of a rubber band and stretch it, the molecules in it also get stretched and have to take shapes of elongated line. You know, for molecules, this linear (and hence long) state is special, because there are almost an infinitely more number of more probable, crumpled, shorter states, to which they all want to get back. That's the mechanism by which a stretched rubber band shrinks (we call it entropy elasticity). The molecules just wanted to go back mediocrity.
It's like a fad. It's like crowd psychology; everyone wants to join a majority. To say differently, if a person is pure, aloof or special, s/he has a power.
So here it is. Fractal again. Why does a tendency repeats itself in different layers; physical nature of things and human mentality? God knows.