"Regular maps have few surprises: their contour lines reveal where the Andes are, and are reasonably clear. More precious, though, are the unpublished maps we make ourselves, of our city, our place, our daily world, our life; those maps of our private world we use every day; here I was happy, in that place I left my coat behind after a party, that is where I met my love; I cried there once, I was heartsore; but felt better round the corner..., things of that sort, our personal memories, that make the private tapestry of our lives."