I ride the NYC subway trains, usually in the evening when the seats are full. I focus on the shape of the space between the person sitting next to me and myself. I attempt to mentally and emotionally re-sculpt that space. In my mind, I reshape it — from the stiff and guarded space between strangers to the soft and yielding space between friends. I direct all my energy to this space between us. When the space palpably changes, and I completely feel like the stranger sitting next to me is my friend, I rest my head on that person's shoulder...

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"In some anthropology departments, they're now doing walking as a Ph.D.," said performance artist Moira Williams, who is a founding member of the New York Walk Exchange, a group that develops creative walks that emphasize the body as "a way to produce and transmit knowledge." Her projects are more explicit performances, which intervene in the world. For one ongoing work, Exchange, she glued seeds beneath her arm. Days later, when they germinated, she transplanted them into the pouch of a shirt she tailored with a built-in watering system and roamed her mystified neighborhood asking residents for water. When the seedlings grew, she planted them into a barren patch of earth, an act that emphasized her physical relationship with the environment.