The station entrances of the Nord-Sud company, in ceramic and iron, are of a more sober styling than the Art nouveau designs of Hector Guimard for the CMP's entrances. The word "Nord-Sud" appeared in white on red for the maximum visibility at a distance. In the 1970s, the Hector Guimard entrance from Hotel de Ville station was moved to Abbesses station. In the stations, the supporting walls are vertical and not vaulted, and the ceramic tiles carry the customary "NS" logo of the company. The tile trims are brown in stations without a transfer, and green in those with. Madeleine station has blue tile trim because of its connection with the CMP. In addition, on the headwalls of the tunnels a signage indicate the direction of the trains accompanied by an arrow indicating the platform on the right. All stations on the line inside Paris had this signage, though some have disappeared in renovations over the years. At each station between Solférino and Notre-Dame des Champs (except Rue du Bac) are inscribed "DIRON MONTPARNASSE" or "DIRON MONTMARTRE". In the north, at Marcadet – Poissonniers, Lamarck – Caulaincourt and Abbesses, the signs on the headwalls are "DIRON PTE de VERSAILLES"/"DIRON PTE de LA CHAPELLE". In the south, at Falguière, the signs are "DIRON PTE de VERSAILLES"/"DIRON MONTMARTRE". Two stations, due to their depth underground, have lifts: Abbesses and Lamarck – Caulaincourt. Five stations have unique décor, each based around a single theme: Abbesses, Concorde, Assemblée nationale, Montparnasse – Bienvenüe and Pasteur. Abbesses station can be accessed via two shafts, one for the lifts, the other the stairs which are decorated with, on the descent, famous sights in Montmartre such as the Moulin Rouge, Sacré Coeur or place des Abbesses, and depictions of nature and daily life while ascending. This installation was painted in 2007 to replace a mosaic patchwork previously done by artists from the area, which had been vandalised over the years. Concorde station was renovated in the early 1990s, it is decorated with small ceramic tiles, each depicting a different letter. Together forming extracts from the Déclaration des droits de l'homme et du citoyen de 1789, the design was conceived by Françoise Schein. Since 1990, Assemblée nationale station no longer carries election material, but the posters show heads in silhouette, representing the deputies of l'Assemblée nationale. It was designed by Jean-Charles Blais and is regularly refreshed according to the