on March 5, 1998
This is the recapitulation of the gestation of McLuhan's thought, which culminates in the Laws of Media. The beginning of the book is almost as incomprehensible as that last sentence, but by the time you get to page 93, you will understand it. McLuhan gives us a tool with which to dig out an understanding from the media we see around us. His tetrad approach to analysis is ably illustrated by his poetic examples in part 4. It's not that things get more apparent, but they do become more transparent from his multiple points of view.
If you've already worked through the Gutenberg Galaxy, and want more, this book is for you. On the other hand, if you are unfamiliar with McLuhan, this might not be the book to start with. However, I found the book to inspire new thoughts and insight that come reflected off his refracting whorl of ideas, so maybe it's as good a place to start as any.