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Mirror Line

Paywall, so I could only read the first couple of paragraphs. Maybe you can explain to me the point of a 75 mile long building. I can't imagine how it could be functional (much less 2 of them running parallel to each other).
 
Paywall, so I could only read the first couple of paragraphs. Maybe you can explain to me the point of a 75 mile long building. I can't imagine how it could be functional (much less 2 of them running parallel to each other).
I was just marveling at the scale of the idea. Lots of basic questions about practicality.
 
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