Semacode street history

Elliott Malkin's digital graffiti project, eRuv: a Street History in Semacode, uses
semacodes to deliver historical audio content to New Yorkers and tourists following the route of the former 3rd Avenue elevated train in Lower Manhattan. The line marked a historical religious boundary known as an eruv for the immigrant Polish Chasidic Jewish community who inhabited the area during the first half of last century. Locations along the route are marked with
semacode IDs, which are cameraphone-readable 2D barcodes that encode data. Participants read the codes to receive the audio relevant to that location, and can leave their own voice messages with their experiences of the spot or reactions to the stories. It definitely beats those cheesy cassette-tape tours usually offered to tourists.

[Via Near Near Future]