Vannevar Bush fully envisioned the World Wide Web 50 years before it actually appeared. Like Babbage's Analytical Engine, it was never built. He called his "web browser" a Memex. The design used electrical wires and microfilm files filling a desk to create the equivalent experience of web surfing - in particular, "hyperlinking" one page of data to another. There are two screens, one for visual display of information, and another - a touch-sensitive pad - for writing and drawing.