alternatively, along vaguely similar lines to the eye the city project, you could have photographs depicting a day in the life of singapore, shot near MRT stations. make it such that each MRT station is at least partially visible in the photograph, say in the background, reflected in a puddle/mirror etc. if you don't have enuf photogs, those who are available will have to cover more stations. i suggest photogs shooting that day in three teams, to cover the three MRT lines. should be enuf time to shoot all 64 MRT stations in one day.