There is another twist to a Foucault pendulum. If the cable is long enough (that's why they are located outside or in multi-story halls), it is possible to observe another movement of the bob. The path of its back and forth course changes slowly. For example, at some point, if the pendulum continues to swing, its path will become perpendicular to its original path, and then slowly move back to its original path. The change in the path is due to the rotation of the earth. Cool, huh?
When watching a pendulum it is easy to believe that the natural state of the structure is the movement of the bob, back and forth, back and forth, and that if it ever stops swinging it must be displaced again, to resume its familiar movement. It is easy to believe that the bob will find equilibrium only if it swings back and forth, from one side to the other, until it finds its proper place. But the truth is, the back and forth is a result of a disruption of the natural state of the pendulum, of being at rest in its point of equilibrium. The back and forth is merely visual evidence of the power of gravity and the fixed point, constantly pulling the bob back to its proper place, never letting the bob fully escape its grip.
I like it when the pendulum is displaced and I can watch it swing..
But in this world of humanity the pendulum seems to be swinging from extreme to extreme wildly. As it is moved by this displacement it is then subject to other pulls of this world that change its path. The point of equilibrium is only a blur as we go screaming by at break-neck speed. We pull against the other, displacing our world from its perfect place, as if we can win the contest with brute force, as if the bob will come to rest not at the point of equilibrium, but at the unlikely point at the extreme to which we, in our own interest, have pulled it.
But we can't.
When we exert power over another in any way, it is only temporary. The pendulum will swing. And, unfortunately, it will not stop at the point of equilibrium. The power of the other will pull it to the other extreme. And so on and so on.
And the truth is just a passing blur.
Until we stop pulling against each other.
You go first . . .