In the twentieth century, new materials and construction techniques contributed to a change in architectural style. A. At the end of the nineteenth century, the emphasis was on preserving and conserving historic civic buildings rather than on creating new large structures. B. In his influential book Toward a New Architecture, Le Corbusier argued that builders and engineers ought to lead a new revolution in building design. C. Modern architects did not accept the traditional distinction between "fine" architecture and buildings that used ordinary materials and a utilitarian design. D. Architects such as Walter Gropius and Frank Lloyd Wright used new materials like plate glass and steel beams to create buildings that emphasized openness, light, and a feeling of weightlessness. E. Steel construction opened up the possibility of very tall buildings, but these skyscrapers also required new technologies such as elevators and fireproofing. F. Unprotected metal can withstand much more compression than traditional masonry but must be reinforced with terra-cotta tile or the like to combat wind shear.