A System of Architectural Ornament According with a Philosophy of Man’s Powers

"A System of Architectural Ornament According with a Philosophy of Man's Powers" is a posthumously published work by American architect Louis Sullivan. It explores his theories on architectural ornamentation, emphasizing that ornament should be integral to the building's design and express its function and materials, rather than being merely applied decoration. Sullivan believed that ornament should arise organically from the structure itself, reflecting a deeper philosophical understanding of human capabilities and the environment. This concept contrasts with earlier architectural traditions that often relied on historical styles or applied motifs without inherent meaning. Sullivan's work championed a unique American architectural style, influencing later generations of architects.12