closed to the public. College Green, opposite the House of Lords, is a small triangular green commonly used for television interviews with politicians. Interior The Palace of Westminster contains over 1,100 rooms, 100 staircases and of passageways, which are spread over four floors. The ground floor is occupied by offices, dining rooms and bars; the first floor (known as the principal floor) houses the main rooms of the Palace, including the debating chambers, the lobbies and the libraries. The top-two floors are used as committee rooms and offices. Some of the interiors were designed and painted by J. G. Crace, working in collaboration with Pugin and others. For example, Crace decorated and gilded the ceiling of the Chapel of St. Mary Undercroft. Layout Instead of one main entrance, the Palace features separate entrances for the different user groups of the building. The Sovereign's Entrance, at the base of the Victoria Tower, is located in the south-west corner of the Palace and is the starting point of the royal procession route, the suite of ceremonial rooms used by the monarch at State Openings of Parliament. This consists of the Royal Staircase, the Norman Porch, the Robing Room, the Royal Gallery and the Prince's Chamber, and culminates in the Lords Chamber, where the ceremony takes place. Members of the House of Lords use the Peers' Entrance in the middle of the Old Palace Yard front, which is covered by a stone carriage porch and opens to an entrance hall. A staircase from there leads, through a corridor, to the Prince's Chamber. Members of Parliament enter their part of the building from the Members' Entrance in the south side of New Palace Yard. Their route passes through a cloakroom in the lower level of the Cloisters and eventually reaches the Members' Lobby directly south of the Commons Chamber. From New Palace Yard, access can also be gained to the Speaker's Court and the main entrance of the Speaker's House, located in the pavilion at the north-east corner of the Palace St Stephen's Entrance, roughly in the middle of the building's western front, is the entrance for members of the public. From there, visitors walk through a flight of stairs to St Stephen's Hall, location of a collection of marbles, which includes Somers Mansfield, Hampden, Walpole, Pitt and Fox. Traversal of this hallway brings them to the octagonal Central Lobby, the hub of the