Sogho Ishii, the Japanese director, introduced me to Kowloon Walled City via the photographs of Ryuji Miyamoto. It was Ishii-san's idea that we should make a science fiction movie there. We never did, but the Walled City continued to haunt me, though I knew no more about it than I could gather from Miyamoto's stunning images, which eventually provided most of the texture for the Bridge in my novel Virtual Light .