One of the exhibition’s organisational challenges was that a station is hosting it, rather than a museum. Philippe Lejeune, the expo’s head of communication, notes: “Because we’re not a museum we can’t exchange artefacts with other museums, so all the pieces came from private collections around Europe.” While this was a difficulty, it also means many rare and scarcely shown works have been accumulated: one was last shown in Germany in the 1970s, while another was last exhibited in Canada in the 1990s.