To most people, it's just trash: A scrap of dirty blanket visible under some stairs. A glimpse of blue tarp peeking out of a bush. A bag of recyclables parked discreetly behind a concrete column.

But Courtney Kanagi, an outreach worker, has learned how to decode bits of urban detritus that most people ignore. She knows what these signs mean: the crawl space beneath the stairs was someone's home.

So Kanagi climbed out of her van and, after a few minutes of poking through the bushes, found a woman sound asleep with a white sheet drawn across her face.