High neoclassicism was an international movement. Though neoclassical architecture employed the same classical vocabulary as Late Baroque architecture, it tended to emphasize its planar qualities, rather than sculptural volumes. Projections and recessions and their effects of light and shade were more flat; sculptural bas-reliefs were flatter and tended to be enframed in friezes, tablets or panels. Its clearly articulated individual features were isolated rather than interpenetrating, autonomous and complete in themselves.
Neoclassicism also influenced city planning; the ancient Romans had used a consolidated scheme for city planning for both defense and civil convenience, however, the roots of this scheme go back to even older civilizations. At its most basic, the grid system of streets, a central forum with city services, two main slightly wider boulevards, and the occasional diagonal street were characteristic of the very logical and orderly Roman design. Ancient facades and building layouts were oriented to these city design patterns and they tended to work in proportion with the importance of public buildings.
Many of these urban planning patterns found their way into the first modern planned cities of the 18th century. Exceptional examples include Karlsruhe and Washington DC. Not all planned cities and planned neighborhoods are designed on neoclassical principles, however. Opposing models may be found in Modernist designs exemplified by Brasilia, the Garden city movement, levittowns, and new urbanism.
(wikipedia)
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