 Each pier was decorated with delicate shafts of dark Purbeck marble with foliate capitals, contrasting with the squat cushion capitals of the limestone shafts.The entire program of work was probably directed by Walter of Coventry.The nave was later divided from the choir by an elegant Perpendicular screen or pulpitum with three arched openings, called the Arundel Screen, which was removed in the mid 19th century but reinstated in 1961.