"I believe in God, only I spell it Nature." -Frank Lloyd Wright
Frank Lloyd Wright (1867-1959), probably one of the best known American architects, designed around a philosophy he called "organic architecture" where the building & it's environment harmonize with each other. According to the Frank Lloyd Wright Foundation, Wright maintained that "the closer man associated himself with nature, the greater his personal, spiritual and physical wellbeing." and this belief was reflected in his designs - a building is more than a structure, it is an environment. And more than just containing an internal environment, a building reflects it's external surroundings as well.
Quoted on the website of the Frank Lloyd Wright Foundation: "'In organic architecture then, it is quite impossible to consider the building as one thing, its furnishings another and its setting and environment still another,” he [Wright] concluded. “The spirit in which these buildings are conceived sees all these together at work as one thing.'"
Wright's love of nature and believe in it's wonder, reflect his immersion in both Unitarianism and Transcendentalism. This way of thinking about harmony between elements, and the preservation of the "purity" of nature, has connections to Unitarianism (his mother's family faith), and Transcendentalism (the intellectual movement that began in the 1820s and 1830s).
"Beautiful buildings are more than scientific. They are true organisms, spiritually conceived." -Frank Lloyd Wright, 1941