What are edge cities?

Famous quotes containing the words edge and/or cities:

    As I came to the edge of the woods,
    Thrush music—hark!
    Now if it was dusk outside,
    Inside it was dark.
    Robert Frost (1874–1963)

    We are a most solitary people, and we live, repelled by one another, in the gray, outcast cities of Cain.
    Edward Dahlberg (1900–1977)