architect, Frank Lloyd Wright, innovative design, organic architecture, Fallingwater, horizontal lines, cantilevered terraces, stained glass, Prairie Style, Guggenheim Museum, spiral structure, natural materials, stone and wood, open floor plan, integrated with landscape, large windows, natural light, mid-century modern, Taliesin, geometric patterns, Usonian houses, broad overhanging eaves, indoor-outdoor connection, American architecture icon, UNESCO World Heritage.