Everything is balanced. Everything physical (matter/energy) goes back and forth in balanced circles, cycles, or the equivalent. Birth-death, old-young, big-small, strong-weak, start-stop, up-down, rich-poor, beginning-end, fast-slow, hot-cold, pain-pleasure, win-lose, day-night, full-empty, high-low, in-out, success-failure, united-divided, give-receive, creation-destruction, on-off, positive-negative, etc.

Positive and negative forces moving in balance are the physical universe.