Graffiti Archeaology

MetaFilter: Graffiti Archeaology
Graffiti Archaeology Pretty cool flash app that lets you view photos of the same walls in San Francisco over time, as the many layers of graffiti accumulate. To anyone that has ever ridden the Caltrain, a lot of these walls should look familiar.
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http://www.metafilter.com/mefi/30342
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