The fence equilibrium

In theory , many things can be seen as there being a certain equilibrium. It's hard to explain in just a few words but the idea is the following. Some people loose weight, some people gain it. Some people shave, others grow beards. You move into this city others are leaving...and you can keep thinking about examples until you reach the fences. Yes, some fences are put up, just like in Mexico, and others are knocked down, like the one in the back of my house. And as much as I disagree with the border approach, it was my turn to be involved in proving the equation. Might there be science behind this tragic-comic situation. In summary, R=reverse and D=drive, got it? The car had been previously tested by parking it into a space smaller than itself, and this time again it proved tougher than iron.