It is very hard to imagine what the London Underground looks like as a 3 dimensional object. The best representation to my knowledge is the Tube map. It takes the spaghetti network and manages to show it in an incredibly simplistic 2 dimensional view.
The first and vital point is that website's are 3 dimensional. When a person links from one page to another they are moving on the web, through the web. An Information Architect creates the 3 dimensional journey's which people will take through the website.
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So, looking at the Tube map, notice how the stations sit on Tube lines. Imagine that each station is a web page. Each station lies on a line. Each line is a user journey. People move through the network of stations and lines on the Underground to come to their destination. Building a website is the same. Information Architects create user journeys made of linking pages and information. Users then move through that.
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