The result is the pendulum keeps on moving back and forth -- cause and affect. As I understand it, a pendulum uses gravity to transfer potential energy to kinetic energy and back again. When the pendulum reaches the bottom of its swing, it presses a small lever that causes it to click. The pendulum swings and keeps balance to life...everything happens for a reason.
Gravity vs Zero-Gravity
Giving vs Receiving
Loss vs Gain
Life vs Death
Balance vs Imbalance thrown out of equilibrium