The British Museum is everybody’s idea of a museum, but at the same time, it is hardly like a museum at all. It is more like a little state. The rooms you visit on a day out are the least of it: the museum is not the contents of its display cases. It is an embassy, a university, a police station, a science lab, a customs house, a base for archaeological excavations, a place of asylum, a retail business, a publisher, a morgue, a detective agency. “We’re not a warehouse, [or] a mausoleum,” its chair, the UK’s former chancellor George Osborne, told guests at the museum’s annual trustees’ dinner in November. On the contrary, it is both these things, and others beside.