One day, more than twenty years ago, Zdenka Volavka found a lost treasure: the investiture regalia of the African kingdom of Ngoyo, dating from the Iron Age of the second millennium. The plaited copper crown or mpu, turned upside-down and filled with a jumble of metal objects, was on display in the MusTe de l'Homme in Paris, ignominiously labelled as a 'fishing basket.' These objects became the focus of Volavka's research in her remaining years,...