the colour of the spaces between streetlamps
from http://www.prospectmagazine.co.uk/2010/01/how-slums-can-save-the-planet/ : "in his 1985 article, calthorpe made a statement that still jars with most people: 'the city is the most environmentally benign form of human settlement. each city dweller consumes less land, less energy, less water, and produces less pollution than his counterpart in settlements of lower densities.'"