Peripatetic philosophy of walking one's life. Presented as the 2012 Graduation Speech at the University of Pennsylvania by Nipun Mehta, founder of ServiceSpace, promoting a gift economy.
And his TedX talk: http://www.youtube.com/watch?v=kpyc84kamhw
Sam Bower of greenmuseum.org shared this link with me.
While searching online for a walking image on Wikimedia Commons, I came across these Walking House images by Rainer Halama. Walking House is a project of Emscherkunst2010 Künstlergruppe N55.