W. Boyd Rayward’s The Universe of Information constructs Paul Otlet as a foundational figure in the modern history of documentation, arguing that his work transformed bibliography from a technical auxiliary of scholarship into an ambitious intellectual and institutional programme for organising world knowledge. Otlet’s significance lies not merely in his role, with Henri La Fontaine, in creating enduring international bodies such as the International Federation for Documentation and the Union of International Associations, but in his conviction that knowledge could be classified, correlated and made universally accessible through systematic documentary apparatus. Rayward shows that Otlet’s intellectual formation was shaped by positivism, synthesis and a lifelong desire to impose order upon dispersed facts; even as a child he classified notes, papers and observations, foreshadowing the later ambition to construct a universal repertory of knowledge . This ambition matured into the Universal Decimal Classification and the Universal Bibliographic Repertory, both of which sought to convert scattered documents into an organised map of human understanding. The decisive case study is the Mundaneum, conceived not simply as an archive or museum, but as a material and symbolic centre for universal documentation, where bibliography, classification, international cooperation and social progress converged. Rayward’s synthesis also stresses the tragedy of Otlet’s vision: many schemes failed not because they lacked conceptual power, but because governments remained indifferent, technologies were insufficient, and the computer had not yet arrived. Yet this very belatedness makes Otlet prophetic. His anticipation of microfilm, networked access, cooperative indexing and global information control places him at the prehistory of information science, revealing documentation as both an epistemic technology and a utopian project. Rayward’s conclusion is therefore clear: Otlet imagined a world in which organised knowledge could become an instrument of civilisation, peace and collective intelligence.