The Pennethorne Gallery has an elaborate tripartite top lit plaster ceiling. Like the two other main galleries, the Chambers Gallery and the Nash Gallery, its walls are hung with an Isle of Bute wool fabric which allows exhibits to be hung on the walls without causing unsightly marks that need to be repaired between exhibitions.  Here the fabric is in a vivid green colour, with a deep skirting of polished black marble. This room has been designed to exhibit paintings, furniture and other works of art from the Royal Collection, to be seen as they would be in a palace room.  Two small Cabinet Rooms lead off this space.  These contain specially designed cases which allow for the exhibition of small objects, such as miniatures, porcelain, silver and jewellery.