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Introduction First!
If you choose to read the introduction, you get somewhat of an introduction. The website states, “This is an extensive revision of a Web fiction originally released in 1995. The current text consists of about 175 pages traversed by more than 700 links. Most of these pages carry instructions that cause the browser to refresh the active window with a new page after 30 seconds.”
In my opinion the greatest thing about the introduction is this piece of advice. “The best way to encounter this work is simply to dive in though some may prefer a more stable reference point. For these readers, there is an index to particularly interesting places in the text. You may want to go to that page and bookmark it.”
So if you choose to go through the introduction, you can start with the index which gives you somewhat of a structure.