How was the entrance hall at Syon House based on a Roman basilica?

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The entrance hall at Syon House, redesigned by Robert Adam starting in 1762, is considered one of the most significant Neoclassical interiors in England.1

Adam based the design on the architectural form of a basilica, which is defined as a rectangular structure divided into three distinct areas by two rows of columns. In addition to this layout, the hall features half-domed ends, a characteristic that reflects Adam's creative adaptation of classical Roman elements.1