The project of reconstruction included a new library, on the east side of the Palace. The style was highly classical, and resembled that of the ancient Roman baths; pillars supported five cupolas, over a gallery closed by two semi-circular bays. The lighting came from a recent innovation, skylights; it was later copied in the new National Library of France. The painter Eugène Delacroix was commissioned to paint the interior, a project which lasted from 1838 until 1846. Supported by a team of assistants, Delacroix painted the five cupolas and the two hemicycles of the library with a series of allegorical paintings on the themes of philosophy, natural history, legislation, eloquence, literature, poetry and theology; a panorama of all the aspects of civilization.