I have found myself studying, of all things, a site plan of a bicycle path in the City of Portola. Why would a small-town bike path be interesting, particularly one that exists only on paper? Perhaps because site plans, like all maps, seem so static, while the dotted line that represents the bike trail suggests movement and freedom. It is easy to imagine ourselves as tourists on bicycles in this small mountain town in the Sierra Nevada, tooling through the historic district, and then crossing the bridge...