Vitra designer Sori Yanagi was a Japanese designer who was responsible for creating some of the most iconic furniture designs of the 20th century. His designs were characterized by their simple yet elegant forms and their use of natural materials such as wood, bamboo, and rattan. Yanagi's most famous work is the Butterfly Stool, which has become a design classic and is now considered to be one of the most important designs of the modern era. Yanagi was a key figure in the Japanese mid-century design movement, and his work has profoundly influenced contemporary furniture design.