At the moment Dr Haller, who is now at McGill University in Montreal, is collaborating with Wenbo Tang of Arizona State University and Pak Wai Chan of the Hong Kong Observatory to apply Lagrangian theory to the problem of aircraft taking off and landing in difficult circumstances.
The first English-language film from the Hong Kong-based director Wong Kar-Wai, and the first to be set in America, makes you wonder whether the trip was worth it.