Brewster kahle unlocks the cellar door of a wooden building in San Francisco's Presidio Park. He steps inside, turns on the fluorescent lights to reveal a solid black wall of humming computers, and throws out his arm theatrically. "This", he says, "is the web." It is a seductive idea, but the web isn't really housed in a single San Francisco basement. Mr Kahle's racks of computers merely store archived copies of many of its pages which Alexa, his company, analyses to spot trends in usage. The real Internet, in contrast, is widely perceived as being everywhere, yet nowhere in particular. It is often likened to a cloud.
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