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In page Ancient Roman architecture:

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Concrete quickly supplanted brick as the primary building material,[citation needed] and more daring buildings soon followed, with great pillars supporting broad arches and domes rather than dense lines of columns suspending flat architraves. The freedom of concrete also inspired the colonnade screen, a row of purely decorative columns in front of a load-bearing wall. In smaller-scale architecture, concrete's strength freed the floor plan from rectangular cells to a more free-flowing environment.[citation needed] Most of these developments are described by Vitruvius, writing in the first century BC in his work De architectura.