When I've spent a long time away from the city, in the countryside say, I begin to miss the familiar smells of city life. What I propose is a device, similar to an air freshener, that emits smells familiar to the city dweller.
Example odours :-
Dog dirt
Car exhaust fumes
Acid rain
Farts
Tarmac
Phone Box
Multi-storey car park-- ccaamgw, Jul 19 2000 I can let you have a couple of old tee-shirts - cheap!-- Scott_D, Aug 11 2000 -- Gizmofirst, Oct 11 2000 Hah! Add to these: - Rotting garbage- The smell of thousands of stinkey feet- That icky industrial harbor odor- The stench of the blend of thousand restaurant's exhaust hoods.-- bristolz, Oct 17 2002 diner greasetrap, that'd be a good one.-- illustratedgeek, Mar 18 2006 random, halfbakery