Composition… A Primer on Positive and Negative space. Michael Fulks: "This article will make someone mad. I guarantee it. I am going to challenge what many of you learned in photography about composition. Do you still want to continue?" http://www.apogeephoto.com/mag1-3/mag1-3mf1.shtml
Penrose Tilings and the Golden Mean The British physicist and mathematician, Roger Penrose, has developed an aperiodic tiling which incorporates the golden section and the five-fold symmetry inherent in it. http://galaxy.cau.edu/tsmith/KW/goldenpenrose.html
Some Golden Geometry Here are instructions for constructing the Golden Rectangle, a rectangle whose sides measure 1 and 1.618... http://galaxy.cau.edu/tsmith/KW/goldengeom.html