William Klein has lived many lives. One of the world's most influential photographers, he pioneered the art of street photography and created some of the most iconic fashion images of the 20th century. He also made over twenty films, including the first ever documentary about Muhammad Ali and a brilliant satire of the fashion world, Who Are You Polly Magoo? 　　With a major Tate Modern exhibition currently celebrating his work, imagine... spends time with William Klein to discover the irrepressible, charismatic personality behind a remarkable creative life.