Threads
The fact that you can follow various threads (such as threads on the shifting center in hypertext, or introductions) is an example of how the center of this work moves with the reader. You can also go to the Sections node and pick one of the major threads in the work. You can also go to the Topics Index and follow the links under each topic and create threads in that way. Each one of those threads has at its center a different topic.
The Shifting Center
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