Rococo architecture, emerging in the 18th century as a reaction against the baroque style, is characterized by elaborate curves, delicate details, and asymmetrical shapes, often utilizing pastel colors and decorative motifs like shells and plants. It was primarily favored by the aristocracy and is most associated with the reigns of French kings Louis XV and Louis XVI. This style led to intricate designs that enhanced architectural spaces, including improvements in sanitation and room organization, and it spread across several European countries, with notable contributions from architects in France, Germany, and Russia.