The Weltmuseum Wien holds a Mexican feather headdress that no other museum can match. It is built from concentric half-rings of feathers, quetzal at the outer edge with plumes up to fifty-five centimetres long, and blue cotinga, flamingo and cuckoo feathers worked in behind them. Spread out it measures roughly 116 centimetres high and 175 wide. It sits in a sealed case in deliberately low light, in what is usually the quietest room in the building.
The argument about who should have it has run for decades. Mexico has asked for it back repeatedly; conservators here have concluded the featherwork would not survive the journey, and a copy has stood in Mexico City since the 1940s. Its own story is thinner than the label suggests. The headdress first appears in a castle inventory in the 1590s, and the popular name attaching it to Moctezuma was added much later with nothing solid behind it. Stand in front of it knowing that: the owner, the route and even the name are all contested.