The Art Deco decor of the Carnegie Library, the harmony of its proportions, the elegance of its architecture made it worthy of inclusion in the French inventory of Monuments historiques.

Upon receipt of the order of construction in December 1920, Sainsaulieu undertook a study trip to visit foreign libraries in Switzerland and Belgium.

[4] Under the influence of his son Louis, Sainsaulieu reshuffles his first project (initially very classical), opting for the modern look Art Deco style.

It officially opened to public on June 10, 1928, in the presence of French President Gaston Doumergue and the US ambassador Myron Timothy Herrick.

[5] The Carnegie library of Reims, remarkable for the quality of materials and luxurious ornamentation, boast a very functional space design, rare in France at that time.

At the entrance, two pilasters without capitals are surmounted by a classicist pediment decorated with engraved flowering shrubs and marked with the iron letters of the word "Bibliothèque" (English: library).

The engraved motto of the library reads in Latin "Educunt fructum folia" (English: flowers lead to fruit).

The entire porch was presented at the 1925 Exposition Internationale des Arts Décoratifs et Industriels Modernes and won a gold medal.

Twenty marble mosaics made from cartoons by Henri Sauvage are inserted in the panels and representing the intellectual, physical or manual activities.

The light comes mainly from a large glass ceiling due to Jacques Gruber, famous master glassmaker of Nancy, representing an open book on the arms of the City of Reims.