Editor's Note: The New Food ChainA head of lettuce from the farmers market isn't going to cut it anymore. Locally-sourced food is becoming a sustainable business.

We hear a lot about reinvention--in business, politics, science and technology. It's the mantra of the age: Reinvent or relent. Businesses that fail to constantly challenge and remake themselves run the very real risk of becoming irrelevant.

Sometimes reinvention involves remaking a brand or rethinking a product--something as simple as shoes, maybe. Sometimes it's re-creating an experience, like the simple act of buying shoes.