For a presentation I gave last week on the origin of patterns I found a quite condensed version of Christopher Alexander’s latest book “The Nature of Order: An Essay on the Art of Building and the Nature of the Universe”. The abridged version “Elements of Style” was featured by Wired in December 2003.
You can find my version in English and German at Slideshare.net:
(Let me know if anyone has high resolution images. Mine are a bit jagged.)