Looking at graphic augmentation of the city + civilians.

…from a protest in Paris over the Iranian post-election crackdown, and the murder of  protester Neda Agha-Soltan:

…election posters hung in Tripoli around the election in spring 2009:

…images from Delete! (2005) site-specific project in Vienna, Austria
by Steinbrener/Dempf:

…in Toronto, Sean Martindale and Eric Cheung are turning street ad posters into
planters with The Poster Pocket Plants :

…the Object Orange project in Detroit from 2006:

..where the flat and the fizzy meet, with a cherry on top — artwork by Vinchen: