I was reading an article from The New Yorker and I came across one sentence that I couldn't really understand.
The map runs to sixteen laminated foolscap pages, or about ten square feet, when I tile the pages together. I have been given it on the condition that I do not pass it on. It is not like any map I have ever seen, and I have seen some strange maps in my time.
Is there anybody that could help me to explain/rephrase the second sentence so that the structure or the meaning could be more lucid to understand?
Here's the link for the original article. https://www.newyorker.com/news/dispatch/the-invisible-city-beneath-paris