Undo
… and they all went on as before.
Yet with a difference. For after a thing has happened nothing can ever go on quite as it did before. We may say that it shall, and that it does. We may even believe this. But a happening can never be un-happened and, faint or strong, its colour will creep into the shade of all things and modify it with its own infinitesimal but all-pervading bit of change.
Evangeline Walton: The Maginogion.