http://www.scottaaronson.com/democritus/lec8.html

Penrose, The Emporor's New Mind
Penrose, The Road to Reality

From tablatom: Christopher Alexander, "go either for The Timeless Way of Building of cut to the chase and get the Nature of Order series."

"some have described The Nature of Order as one of the most important documents of the twentieth century. well that was before he missed his deadline and released them in the 21st :)"