FRANCE. PARIS, october 29th of 2019. Palais de Chaillot. Two sculptures of brass which were around the spire of Notre Dame cathedral before its restoration are shown at Cité de l'architecture at Trocadero as well as the coq which was at the top of the spire during the fire. Aurelia Azema and Delphine Syvilay two ingeneers specialised on metal and working at the LRMH laboratory, are making several analysis and researches.