Heinrich Wölfflin in the context of "Architectural style"

Sigfried Giedion (also spelled Siegfried Giedion; 14 April 1888 in Prague – 10 April 1968 in Zürich) was a Bohemian-born Swiss historian and critic of architecture. His ideas and books, Space, Time and Architecture, and Mechanization Takes Command, had an important conceptual influence on the members of the Independent Group at the Institute of Contemporary Arts in the 1950s. Giedion was a pupil of Heinrich Wölfflin. He was the first secretary-general of the Congrès International d'Architecture Moderne (CIAM), and taught at the Massachusetts Institute of Technology, Harvard University, and the ETH-Zurich.

In Space, Time & Architecture (1941), Giedion wrote an influential standard history of modern architecture, while Mechanization Takes Command established a new kind of historiography.

Painterliness is a concept based on German: malerisch ('painterly'), a word popularized by Swiss art historian Heinrich Wölfflin (1864–1945) to help focus, enrich and standardize the terms being used by art historians of his time to characterize works of art.

A painting is said to be painterly when there are visible brushstrokes in the final work – the result of applying paint in a manner that is not entirely controlled, generally without closely following carefully drawn lines. Any painting media – oils, acrylics, watercolors, gouache, etc. – can produce either linear or painterly work. Some artists whose work could be characterized as painterly are Pierre Bonnard, Francis Bacon, Vincent van Gogh, Rembrandt, Renoir, John Singer Sargent, and Andrew Wyeth (his early watercolors). The Impressionists, Fauvists and the Abstract Expressionists tended strongly to be painterly.