Otlet, born in 1868, did not set foot in a schoolroom until age 12. His mother died when he was 3; his father was a successful entrepreneur who made a fortune selling trams all over the world. The senior Otlet kept his son out of school, out of a conviction that classrooms stifled children's natural abilities. Left at home with his tutors and with few friends, the young Otlet lived the life of a solitary bookworm.

When he finally entered secondary school, he made straight for the library. "I could lock myself into the library and peruse the catalogue, which for me was a miracle," he later wrote. Soon after entering school, Otlet took on the role of school librarian.

In the years that followed, Otlet never really left the library. Though his father pushed him into law school, he soon left the bar to return to his first love, books. In 1895, he 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 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.

As the Mundaneum evolved, it began to choke on the sheer volume of paper. Otlet started sketching ideas for new technologies to manage the information overload. At one point he posited a kind of paper-based computer, rigged with wheels and spokes that would move documents around on the surface of a desk. Eventually, however, Otlet realized the ultimate answer involved scrapping paper altogether.

Since there was no such thing as electronic data storage in the 1920s, Otlet had to invent it. He started writing at length about the possibility of electronic media storage, culminating in a 1934 book, "Monde," where he laid out his vision of a "mechanical, collective brain" that would house all the world's information, made readily accessible over a global telecommunications network.