The screen, retable or reredos are commonly decorated. Many altars have both a reredos and a retable. A retable which incorporates sculptures or painting is often referred to as an altarpiece. The church is presided by a superb polychrome wood retable. The term "reredos" is sometimes confused with the term "retable". The retable was completed in the beginning of the 1440s. The black marble retable is allegedly executed from designs by Lancelot Blondeel. A 1540 retable is the earliest known piece of artwork depicting these two saints. The most important parts of the chapel are its main retable, grid and vault. The retable may hold flowers and candlesticks. Bitti also made a retable in St. Peter's Church. The retable of the Rosary has also survived the destruction in 1936. Two notable features of the church are the retable and the blue-and-white tiling. The retable consisted of a large relief of the Resurrection. The retable was re-discovered in 1847, having been reversed and used as a table top.