As an aside, here is a post about urban "pathways of desire" with some cool photos: http://www.sweet-juniper.com/2009/06/streets-with-no-name.html http://www.s

As an aside, here is a post about urban "pathways of desire" with some cool photos: http://www.sweet-juniper.com/2009/06/streets-with-no-name.html http://www.sweet-juniper.com/2009/06/streets-with-no-name.ht... and a mathematical model for trail formation: http://www.jamesgriffioen.net/trailmode.png http://www.jamesgriffioen.net/trailmode.png