“It was as if some immense laboratory experiment had gone on for half a century according to rigorous principles: Take a single defeated society, weary with guilt, wounds and hatred, and divide it in two … [and] see what kinds of worlds develop under very different visions of social and political order. […] Twenty years ago [the Wall] seemed immutable, a force that bent the natural world to its demands. Now it seems like something from a storybook.”