“The world has arrived at an age of cheap complex devices of great reliability; and something is bound to come of it.” He proposed a new kind of personal cataloguing machine, called a memex, that would be useful not only to scientists but to anyone employing “logical processes of thought.” Incorporated into a desk, the memex, Bush wrote, “is a device in which an individual stores [in compressed form] all his books, records, and communications, and which is mechanized so that it may be consulted with exceeding speed and flexibility.” On top of the desk are “translucent screens” onto which are projected images of the stored materials as well as “a keyboard” and “sets of buttons and levers” to navigate the database. The “essential feature” of the machine is its use of “associative indexing” to link different pieces of information: “Any item may be caused at will to select immediately and automatically another.” This process “of tying two things together is,” Bush emphasized, “the important thing.”

With his memex, Bush anticipated both the personal computer and the hypermedia system of the World Wide Web.