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We Make Money Not Art defines Medianeras as "the name given in Barcelona to the walls still standing after an adjacent house has fallen apart or has been destroyed." Medianeras are quite haunting, like the ghost of a room.
Link to gallery, Link to Flickr pool
(via We Make Money Not Art)
Update: James points out this other Flickr pool and clarified: "Medianeras is the catalan Spanish word for the wall that separates two buildings regardless of whether one of them has been knocked down or not."
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.