The Great Shaft

I'm starting this age, and someone named Esher wants me to look for a hole.
I'm in a round room, and Esher is sending me through a door.  How do I follow?
I saw Esher again in the Great Shaft itself.  Where did he go?
When will I meet Esher again in this age?
How I get across the Great Shaft near the second elevator?
Where is the fan that Esher was talking about, and how do I turn it on?
I've found the fan, but how do I get back to the rest of the shaft?

What is the purpose of the books on pedestals that I see around this age?
Where are all of those books?
What are these journal pages for, and where can I find them all?

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