It was a cold December morning in Paris when Musee D’Orsay, arguably the most popular museum in the city after the Louvre, was formally inaugurated. The French President Francois Mitterrand did the honours and a photograph shows him listening intently to the curator Anne Pangeot, draped in an elegant red shawl, explain the importance of the exhibits. Both of them acted their part and it would be almost a decade and a half later when their secret would be out.