Six years ago, the director of Hong Kong’s M+ museum, Suhanya Raffel, told cultural strategist András Szántó, in an interview for the book The Future of the Museum, that in the years to come museums will need to “stand together and work to help one another to deliver a more sustainable baseline.” Collaboration, she went on, “will be a key aspect of the next chapter of museum work.” Her words seem to have been prophetic: on Friday morning in Hong Kong, M+, the Museum of Modern Art in New York, and the Centre Pompidou in Paris announced a wide-ranging cultural alliance unprecedented in its scale. At the heart of the alliance is an agreement that the three institutions will treat their respective holdings as a shared collection, curated by staff spread across three continents.