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gsps: gumspots positing system

the gumspots positioning system is a project which was just showing at the itp spring show.
Our demonstration of GSPS lets you enter and view hidden data on city sidewalks. A user would take a photograph of the GumSpots with a cellphone and submit it to the GSPS service. The GSPS service would then determine the location and orientation of the image and return the image with extra hidden data displayed on the image. In this case the hidden data will be text as well as 'connect the dot' drawings. A user also has the ability to add hidden text by submitting a note with their image.this is an awesome idea - using the built in randomness produced over time by the littering populace to represent locations, forcing people to look down to orient themselves and get a new perspective on the city.
[thanks engadget]