Final answer:
Louis Sullivan's architectural style exemplifies his utopian ideas, implementing 'Form follows function' to achieve a harmonious blend of functionality, beauty, and societal ideals within his designs, reminiscent of utopian socialism's aspirations for a better communal society.
Step-by-step explanation:
The style of Louis Sullivan's buildings reflects his utopian ideas about society and the universe by embodying the principle that 'Form follows function.' Sullivan believed that architecture should not only fulfill practical needs but also attend to aesthetic, psychological, and cultural aspects, thereby fostering a better living environment. His architectural philosophy was akin to utopian socialism's ideals of improving society through cooperative living and the integration of innovation and community well-being. Living in the era of early modernism, Sullivan, alongside other architects, worked towards marrying new technologies with traditional design frameworks. The resulting structures—often unique to their context and location—were representative of the unified and ideal society he envisioned, a reflection of Sullivan's broader philosophical reflections on the role of architecture in the evolution of society. Therefore, the functional, innovative, and organic qualities of Sullivan's architecture were expressions of his larger utopian vision, which sought harmony between humans, their buildings, and the greater universe, much like how utopian socialists envisioned an improved communal society.