When Magnum conceived an assignment on the theme of the "new Europeans," meaning the 10 countries that had all entered the European Union at once on May 1, 2004, 10 Magnum photographers volunteered, each for very personal reasons and with a very personal approach. The rules were simple: rather than the misleadingly vain "portrait" of a country that this kind of short-term assignment often yields, each photographer was to give an account of his or...