Otlet’s vision hinged on the idea of a networked machine that joined documents using symbolic links. While that notion may seem obvious today, in 1934 it marked a conceptual breakthrough. “The hyperlink is one of the most underappreciated inventions of the last century,” Kelly said. “It will go down with radio in the pantheon of great inventions.”

As the Mundaneum museum celebrate its 10th anniversary, the curators are planning to release part of the original collection onto the present-day Web. That event will not only be a kind of posthumous vindication for Otlet, but it will also provide an opportunity to re-evaluate his place in Web history.

In 1895, Otlay met a kindred spirit in the future Nobel Prize winner Henri La Fontaine, who joined him in planning to create a master bibliography of all the world’s published knowledge.

Even in 1895, such a project marked an act of colossal intellectual hubris. The two men set out to collect data on every book ever published, along with a vast collection of magazine and journal articles, photographs, posters and all kinds of ephemera — like pamphlets — that libraries typically ignored. Using 3-by-5-inch index cards (then the state of the art in storage technology), they went on to create a vast paper database with more than 12 million individual entries.

Otlet and LaFontaine eventually persuaded the Belgian government to support their project, proposing to build a “city of knowledge” that would bolster the government’s bid to become host of the League of Nations. The government granted them space in a government building, where Otlet expanded the operation. He hired more staff, and established a fee-based research service that allowed anyone in the world to submit a query via mail or telegraph —a kind of analog search engine. Inquiries poured in from all over the world, more than 1,500 a year, on topics as diverse as boomerangs and Bulgarian finance.

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