Yellow Arrow

This Washington Post article says "[Yellow Arrow] stickers make a personal point about a public space.Launched last summer by Counts Media,a New York-based arts and gaming company,the Yellow Arrow Project is a kind of geographical blogging. Adherents have been placing the palm-size stickers -- each with a unique code -- on street signs,city monuments,store windows, abandoned buildings -- anywhere,really,that observers encounter what they deem to be "art."Then, using a cell phone,they send a brief text message -- which could be an interesting historical fact, a restaurant review or just some goofy poetry -- to Yellow Arrow. People who come across an arrow can call the Yellow Arrow phone number, punch in the sticker's code and receive that message".

[Targeting the 'Art' Around Every Corner]