On the High Line in Manhattan, I’m thinking of space. How this space was created literally out of thin air — well, that, and an old trunk line and the prodigious dreams of its founders. And how because of this space, a ribbon of elevated parkland in a city desperately in need of a air and greenery, so many other spaces have been created. Chic buildings in what used to be a western wasteland. A skate park at the northern terminus. Viewpoints and wading walks and art installations, soon a gallery at the southern end.

And it’s all built around walking. Moving through space. Creating, with our movement, a space both public and private.