A noted American architect of the early twentieth century discusses universal principles behind the harmonious forms and proportions of ancient and modern buildings. Seven essays by Claude Bragdon offer a master class in the architectural union of art, beauty, and science. His observations and analyses encompass a tremendous variety of buildings, from Gothic cathedrals to Giotto's Campanile to the Taj Mahal, and his examples extend far beyond architecture to the natural symmetry found in the feathers of a peacock's tail, snowflakes, plants, and the human face.