The following differences in plan and detail between nave and choir may also be remarked:-- Besides the transom dividing clerestory from triforium to be found in the nave, there is a second transom in the choir crossing the openings of the triforium. This gives a greater fulness and complexity to the design. In the eastern bays, below the openings of the triforium, the bases of the mullions are elongated to about two feet in length, and between them are cusped arches. These arches and the mullions themselves are set on a slanting ridge, like the mullions of the triforium in the transepts. The vaulting shafts also do not terminate altogether at the point at which the ribs of the vault converge, but the outer ones rise some ten feet higher than the central one, until they are cut short by the spreading ribs of the vault. This is a difference characteristic of the Perpendicular style, which tends to an interweaving of lines, and an abolition of capitals, where possible. The mouldings of the main arches also are broader than on the nave, and the clusters of the piers bolder. It must also be remembered that, as the floor of the choir rises gradually to the east, the proportions of the eastward bays are materially altered, and the main arches are smaller relatively to the clerestory than in the nave. There is no doubt that this change is a fortunate one. It is also lucky that it occurs in that part of the building which otherwise differs least from the design of the nave. Finally, it must be remembered, in accounting for the greater effectiveness of the later work, that a choir design is made for different conditions, and has different objects in view, from that of a nave. It has often been remarked that the nave of York, examined bay by bay, is logical and satisfactory enough. It is only when it is regarded as a whole, and judged as an avenue of stone, that its faults are evident. But the choir is not to be judged as an avenue of stone at all. It is cut in half by the altar. Its lower storey is concealed by the stalls, and its continuity broken by the eastern transepts. In the nave, the lowest storey is the weakest. The thin pillars and the broad arches make too little division between the nave and the aisle. The whole is seen at a glance, and there is little of the mystery and shadow generally to be found in a large Gothic interior. Also the actual design of the pillars is poor. They do not fit well on to the arches above them. They seem almost insecure. If these faults exist in the choir, they are concealed by the stalls, and east of the altar by the change in proportions. The choir itself is like an enormous college chapel. The aisles exist, but play no part in the design, which still culminates in the splendid blaze of glass from the eastern transepts and the great east window, and once culminated on the still more splendid blaze of the altar. [Illustration: The Choir, looking West.]