Book excerpt: "Tianshu: Passages in the Making of a Book" examines Tianshu with a focus on the bibliographic and technical details of the work and contains new essays by Xu Bing (published both in Mandarin and in translation); John Cayley (Brown University); Professor Lydia Liu (Columbia University); and Professor Haun Saussy (Yale University). It also includes an essay from 1994 on Xu Bing's "nonsense writing" by Professor Wu Hung (University of Chicago); a detailed bibliographic description of the Tianshu; and a thorough exhibition history. This book is the most comprehensive study of the Tianshu to date.