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In page Louvre:

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The main change of that period was to the building itself. In the 1850s architects Louis Visconti and Hector Lefuel created massive new spaces around what is now called the Cour Napoléon, some of which (in the South Wing, now Aile Denon) went to the museum.[2]: 52-54  In the 1860s, Lefuel also led the creation of the pavillon des Sessions with a new Salle des Etats closer to Napoleon III's residence in the Tuileries Palace, with the effect of shortening the Grande Galerie by about a third of its previous length. A smaller but significant Second Empire project was the decoration of the salle des Empereurs below the Salon carré.[citation needed]