The Desire Paths Flickr pool. Desire paths are improvised paths built collectively by pedestrians trying to find the shortest way across the grass, like ants laying down pheromone trails to food. I've heard of some clever institutions who wait for desire paths to be laid down by pedestrians and then put permanent sidewalks in those places.
...is a weblog about the liberal arts 2.0 edited by Jason Kottke since March 1998 (archives). You can read about me and kottke.org here. If you've got questions, concerns, or interesting links, send them along.