A new exhibition in Hamburg by curator Roger M. Buergel (still known for his provocative Documenta 12 in 2007) “delivers on its contention that European museums need to do much more than just restitute plundered objects in their collections, important as that is. A 21st-century universal museum has to unsettle the very labels that the age of imperialism bequeathed to us: nations and races, East and West, art and craft.”