Raymond Moore : “If I were dropped into (the middle) I don’t think I’d want to photograph, I’d have to move out to the edge. Definite statements have something preaching about them. I’ve always been interested in the point where cultures meet."

http://www.weepingash.co.uk/index.php?option=com_content&view=category&layout=blog&id=36&Itemid=6

My idea to focus our attention, is to look for boundaries, borders, frames and edges.
Off the top of my head, here are a few ideas that might prove fruitful:

Old Town/New Town,

History and modernity,

Past and present

Ugly/beautiful

Imaginary

Historical – Cannongait

Geographical – Rivers, mountain

City boundaries

Greenbelt, bypass

Within the image – acutance, composition lines, juxtaposition, reflections, framelines, barriers

Pictures:

Brookes Jensen – working in series:

http://www.brooksjensenarts.com/

Colin Baxter:

http://www.colinbaxter.co.uk/products/largeportfolios.html

Jerome Lorieau – striking travel and photojournalism:

http://jeromelorieau.photoshelter.com/gallery/Photos-of-Edinburgh/G0000Ex6IxrMT5Rw/P0000tdUPjFo8szE

David Springford: mono ‘fine art’ pictorial:

http://www.infinityphotos.co.uk/collections/edinburgh-reflections-photographs-of-edinburgh

Eugene Atget at Getty:

http://www.getty.edu/art/gettyguide/artMakerDetails?maker=1763&page=5

and at Photography Now:

http://photography-now.net/eugene_atget/index.html

Josef Sudek, Czeck ‘Poet of Prague’

http://photography-now.net/josef_sudek/

Andre Kertesz

http://photography-now.net/andre_kertesz/index.html

Edwin Smith

http://www.chrisbeetles.com/gallery/picture.php?pic=71008

http://www.vam.ac.uk/vastatic/microsites/photography/magnify.php?imageid=im00260