But the country was ruined and the clergy's coffers were empty. A man took up the double challenge of urgency and budget: the architect Auguste Perret. Building quickly and cheaply at that period meant building with reinforced concrete. This unloved material was considered shameful and only fit forindustrial use. Thirteen months of work on site was enough to build this, "Concrete Holy Chapel ", a magnificent demonstration of the plastic and constructive qualities of this material and a splendid lesson from an architect, for a time forgotten, who revolutionised the language of architecture.