Drawing on the latest research and exclusive access to archival materials, this visually stunning monograph traces Otto's groundbreaking career as one of the twentieth century's most important and influential architects. Published to mark the architect's centennial, this beautifully illustrated book celebrates Frei Otto's groundbreaking achievements in creating lightweight architectural structures and pioneering sustainable design practices. Featuring insightful essays by leading scholars and a thematic overview of his most important works, the book investigates Otto's mastery of tensile structures, his innovative application of biological principles to architecture, and his trailblazing use of unconventional materials and construction techniques. Otto's forward-thinking approach paved the way for energy-efficient and environmentally conscious architecture long before these ideas became mainstream. With plans and photographs from the saai archive for architecture and civil engineering at the Karlsruhe Institute of Technology, which highlight the influence of natural concepts in his work, this monograph serves as an essential introduction to a visionary architect who provided a blueprint for creating sustainable, functional, and harmonious buildings.