On a cloudy day in October, Hinemoana Baker walked into a white room at the Ethnological Museum in southwestern Berlin, dressed in all black. A New Zealand poet and musician, Baker is a descendant of both the island nation’s indigenous Maori people and Europeans. As she entered the room, she began to utter a Karanga, a traditional Maori call, in a poignant, almost weeping sound. Following her were two museum staff, each carrying a paper box. Inside the boxes were what Baker regarded as her ancestors—two mummified and tattooed Maori…