The word "νήμα" (thread) is only one letter away from "νόημα" (meaning). However, this one letter makes a significant semantic difference.
The book deals with what its title says: the threads, the strings, the paths of meaning that connect a range of disparate things. Very disparate things!
The Threads of Meaning exist everywhere. But a magical approach, a magical mindset is needed.

In Magic, the pattern is recognized; in Science, it is discovered (the word "discovery" implies something that already existed). Magic doesn't care if the pattern is "true" or "false" as long as it can be experienced. After all, the magical method is to act as if the theory you adopt is true until you do your job. Then you reject it and replace it with another one.