"Glass is destined to play an important role in metal-architecture. In place of thick walls whose solidity and resistance is diminished by a large number of apertures, our houses will be so filled with openings that they will appear diaphanous. These wide openings, furnished with thick glass, single- or double-paned, frosted or transparent, will transmit—to the inside during the day and to the outside at night—a magical radiance." Gobard, "L'Architecture de l'avenir," Revue générale d'architecture (1849), p. 30 [S. Giedion, Bauen in Frankreich (Leipzig and Berlin, 1928), p.18. [T1a,4]