The most important church decorated by the "Ateliers" was the Église du Saint-Esprit in Paris, finished in 1934. The murals and frescoes in the interior were painted by George Desvallières, Robert Poughéon, Nicolas Untersteller and Elizabeth Branly.The church was decorated by members of the Ateliers d'Art Sacré, showing the history of the church militant and the history of the church triumphant from the 2nd to the 20th century. To ensure unity in the decorations the architect imposed a standard height for all the people depicted, and red as the color of all the backgrounds. The central theme of the paintings is "the history of the church militant and the history of the church triumphant from the 2nd to the 20th century. Denis painted two of the major works, the Altarpiece and another large work beside it. The church murals that he painted were strongly influenced by the Renaissance art he had seen in churches in Italy, particularly the work of Giotto and Michelangelo. He wrote in 1922, "The sublime is to approach the subject or wall with an attitude that is grand, noble, and in no way petty.".