Series: The Physics of the Undo - Part 2 - Building Universes from Code When we ask a piece of software to "Undo," we aren't just asking it to "go back." We are asking it to manage a parallel history of everything that could have been. In engineering, this often leads us to the Command Pattern - an elegant, yet demanding structure where every action is packaged into a discrete object. A Command doesn't just execute an instruction; it stores the "memento" of what the world loo