 The latter are classical in style and serve as the keystones in the jack arches above the windows.Other decorative metal details include four types of molding (dentil, egg and dart, ogee, and plain), a large floral frieze, and chamfered metal panels.The exterior of the Northumberland, in spite of its variety of materials and architectural elements, hardly prepares one for the explosion of decorative features and materials in the main public space of the building.