Rebecca Solnit

As I started to pursue the subject more deeply I realized that walking was this wonderful meandering path through everything I was already interested in - gender politics, public space and urban life, demonstrations and parades and marches. The relationship between walking and thinking and between the mind and the body.

By irreducibly complex I mean a single system composed of several well-matched, interacting parts that contribute to the basic function, wherein the removal of any one of the parts causes the system to effectively cease functioning.