Inside this vast structure, with its tall central nave, galleried aisles, and arched transept, Paxton and his engineer associates, Sir Charles Fox (1810-74) and his partner Henderson (to the two of whom a considerable part of the credit must go), created unwittingly a new sort of architectural space. So large as in effect to be boundless, this space was defined only by the three-dimensional grid of co-ordinates which the regularly spaced iron stanchions and girders provided (Plate 64). These elements, designed for mass-production, and also in such a way that they could be disassembled as readily as they were assembled, had a new sort of mechanical elegance towards which the design of metal components had hitherto been moving only very gradually. The character of the casting process made it only too easy to impose on cast-iron elements all sorts of more or less inappropriate decorative treatments from Gothic to Baroque; only rarely had stylistic detail been successfully reinterpreted, as by Bunning in the Coal Exchange, in terms of the fat arrises and broad radii that are suitable to the material and to the particular method of its production. Even at the Crystal Palace a few touches of ornament provided by Owen Jones (1806-89), who was also responsible for the highly original and rather Turneresque colour treatment, suggest the gap—and, alas, it was in the 1850s a widening gap—between the technicians’ and the architects’ ambitions for iron. Contemporaries had no words for what the Crystal Palace offered. Even today, when the aesthetic possibilities of the new sort of space it contained as well as the technical advantages of its method of assembly from mass-produced elements have been more generally explored, it is not easy to describe Paxton’s and Fox & Henderson’s achievement despite the remarkably complete documentation that exists. The space inside the tall transept (an afterthought designed to allow the saving of a great elm), arched on laminated wooden principals, was more readily appreciated in its day than that in the long nave, because it was more familiar. It is not surprising, therefore, that when the Crystal Palace was disassembled and rebuilt in 1852-4 at Sydenham, where it lasted down to its destruction—ironically by fire—in 1936, the entire nave was arched although with principals of openwork metal rather than of laminated wood.