This was the last town-planning scheme of the Georgian era.

 
Regent Street, St James’s Park (1) and Regent’s Park (2).
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The Quadrant, Regent Street

(Aquatint, c. 1818)
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All Saint’s Church, Regent Street

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The architect Nash, who was a master of curves, used such shapes to solve town-planning problems: the necessity of making Regent Street skirt the existing properties compelled him to give the thoroughfare a waving form, and he used curved buildings as articulations where the street changed direction, such as the Quadrant to the South and the round church of All Saints to the North.