Towards the end of April, on top of Tour Montparnasse in Paris, France, I watched late afternoon fade into dusk and night. As the sun set, the lights of the City of Light came on. A spectacular view, and best of all because, being shot from the Tour Montparnasse, the view does not include the Tour Montparnasse: a truly ugly building from the 1970s that spoils the symmetry of the classical Paris skyline.