Any either way

There is a threshold, metaphorically a border. It is tough to cross, but not impossible. However, there also is a restoring force which is pretty strong. Although, many attempts are made to cross the threshold with some even being successful, the restoring force acts quickly and strongly enough to get it back to the normal state. The default stable state.

Rarely but surely, there come occasions, when an incursion beyond the threshold is too deep for the restoring force. In such cases, the restoring force may make some feeble attempts to negate the effects of the incursion, but quickly recognizes the high improbability of success and gives up. The vestige of the incursion, a deep glaring gash acts as a constant reminder of that unfortunate incident. Such deep incursions would permanently change the configuration. The older state is no longer viable. A new stable state has to be found and is gradually found after a few fluctuations. And life goes on....