How did Robert Adam combine classical architectural elements in new ways?

Robert Adam revolutionized 18th-century British architecture by introducing a new lightness and freedom in the application of classical elements, moving away from the rigid constraints of Palladianism. His approach, known as the Adam style, was defined by a fresh, imaginative synthesis of diverse influences, including Roman archaeology, Italian Renaissance decoration, and contemporary French design.1

Rather than strictly adhering to traditional rules, Adam combined elements in unconventional ways. For example, in the Royal Society of Arts building, he placed Ionic capitals beneath a Doric triglyph frieze—a liberty that earlier architects would have avoided. He also pioneered the concept of "movement" in architecture, which he defined as the "rise and fall, the advance and recess" of different parts of a building to enhance its picturesque quality.1

His innovative use of classical motifs extended to domestic architecture, such as his application of the triumphal arch form at Kedleston Hall and the adaptation of the Portico of Octavia at Osterley Park. Through these methods, Adam transformed both exterior compositions and interior design.1