Alexander is one of my favourite authors, not only because his content is excellent, but also because the books he creates are beautiful artifacts which are a pleasure to look at and read.
While A Pattern Language is great, I’m more fond of A Timeless Way of Building, Alexander’s design manifesto. On the surface it’s an architecture book, but its principles can be applied to a wide variety of design fields. In fact, the book has a positively spiritual tone to it, which turned me off until I began to realize that it was trying to describe something larger and more nebulous than just architecture.
A decent amount of attention has been drawn to his ideas, but I would like to also draw attention to how he designs his books, as it’s a great example of attention to detail. The very way the book is structured is nothing short of brilliant - he has built in a system that makes it easy to skim the contents of the whole book incredibly quickly.
Basically, certain passages are italicized. For the reader who wants to speed through in “less than an hour”, you simply read the bits in italics. For everyone else, read through as normal. The description is deceptively simple, as the real effort went into writing and editing the book to be read in two different modes.
Here is a scan of the first page:

He says of his formatting:
What lies in this book is perhaps more important as a whole than in its details. If you only have an hour to spend on it, it makes much more sense to read the whole book roughly in that hour, than to read only the first two chapters in detail. For this reason I have arranged each chapter in such a way that you can read the whole chapter in a couple of minutes . . .
The great thing about it is that it takes virtually nothing away from the reader who wants to read everything. It is easier to scan, but it’s also great for going back and refreshing yourself on the contents, which at nearly 550 pages would otherwise take some time.