What is kind of beautiful about Katrina is that even though the media and officials are working hard at telling us everyone in New Orleans was a monster, in the immediate aftermath more than 200,000 people invite displaced strangers into their homes through hurricanehousing.org and an uncounted horde go to New Orleans and the Gulf Coast to give, to love, to be in solidarity, and to rebuild.

Cities have always offered anonymity, variety, and conjunction, qualities best basked in by walking: one does not have to go into the bakery or the fortune-teller's, only to know that one might. A city always contains more than any inhabitant can know, and a great city always makes the unknown and the possible spurs to the imagination.

There was an assumption that aerial bombing of civilians in World War II would cause fragile, working-class people to basically have nervous breakdowns and it would paralyze the state. That was the logic of aerial bombing. In fact, it doesn't happen at all, but the logic behind aerial bombing has never stopped, even though it never demoralizes, terrorizes, or paralyzes a population.

Credibility is a basic survival tool.

Walking articulates both physical and mental freedom.

Places matter. Their rules, their scale, their design include or exclude civil society, pedestrianism, equality, diversity (economic and otherwise), understanding of where water comes from and garbage goes, consumption or conservation. They map our lives.

I'm a big fan of the vigor of civil society, political engagement, and public life in many parts of Latin America.