moleskinerie: The Beauty of it All...
http://www.moleskinerie.com/2009/07/the-beauty-of-it-all.html
"I am not the only one to suspect or confirm the Moleskine® and Phi association! I had noticed long ago that the proportions to my pocket Mole were extremely conducive to not only sketches, but the formatting of my writing just takes on a life of it's own. One day, out of sheer curiosity, I did the measurements, and lo and behold, the Moleskine® is almost a perfect Golden Rectangle. "