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.

Perhaps the central question about [Eliot] Porter's work is about the relationship between science, aesthetics, and environmental politics. His brother, the painter and critic Fairfield Porter, wrote in a 1960 review of [Porter's] colour photographs: 'There is no subject and background, every corner is alive,' and this suggests what an ecological aesthetic might look like.

The desire to go home that is a desire to be whole, to know where you are, to be the point of intersection of all the lines drawn through all the stars, to be the constellation-maker and the center of the world, that center called love. To awaken from sleep, to rest from awakening, to tame the animal, to let the soul go wild, to shelter in darkness and blaze with light, to cease to speak and be perfectly understood.

Hope is not a lottery ticket you can sit on the sofa and clutch, feeling lucky. It is an axe you break down doors with in an emergency. Hope should shove you out the door, because it will take everything you have to steer the future away from endless war, from the annihilation of the earth's treasures and the grinding down of the poor and marginal. To hope is to give yourself to the future - and that commitment to the future is what makes the present inhabitable.

Anarchists believe that we can govern ourselves in the absence of coercive and centralized authority; the underlying premise about human nature (to use an infinitely problematized but necessary term here) is fundamentally positive. And the evidence that in disasters people are really pretty kind, generous, brave, resourceful and creative fed that.

Activism is not a journey to the corner store. It is a plunge into the unknown. The future is always dark.

Leave the door open for the unknown, the door into the dark. That’s where the most important things come from, where you yourself came from, and where you will go.