This entry by Edina Tokodi was posted on the blog IInhabit

Pull Quote:
"One of our favorite green public artists, Edina Tokodi, is at it once again with her shape-shifting moss graffiti and urban guerrilla tactics. Tokodi was recently commissioned by SEPTA (Southeastern Pennsylvania Transportation Authority) to encourage Philadelphia's commuters to 'Go Green' with her navigable moss icons and green walls in the Market East Station's passenger service area, ticketing area, and on the exterior of the station building and Transportation Museum. The initiative is part of SEPTA's mission to help commuters become more aware of the positive environmental impact of using mass transit regularly."