In a dark Berlin synagogue, a mournful clarinet revives the lost music of a forgotten Jewish composer. In an echoing Bundestag hallway, a collection of 16 objects – including a blonde doll named Inge – recalls lives lost and lives saved. And in the bright parliamentary chamber, a gay man stands, tall and proud, after relating how his persecution under Nazi-era laws began – in 1964. When, on Friday, Germany marked its greatest disgrace, the murder of six million European Jews eight decades ago, it tried to do something new – and risky. As the last Jewish survivors pass on,...