2007 年 72 巻 619 号 p. 223-230
The purpose of this paper is to make clear how the "mobile equilibrium", which is essential concept in Louis Sullivan's architectural thought, is expressed in his building design. We analyzed his facades focusing on the vertical elements (pier, mullion, etc.) which have the most primitive meaning for Sullivan, from two points of view; the composition method of facade, and the ornamental motifs. As to the former, he gradually made the composition synthesized to visualize the "mobile equilibrium" of moving force in structure. As to the latter, he used botanical ornament accompanied with the vertical elements, to represent whole facade as one growing organism.