Patronato Santo Antonio, a Brazilian organization dedicated to helping get kids off the streets, used these very striking black and white images along with bold copy in order to make people "feel" what it would be like to live on the street like a dog, or compares a child to a vulnerable city statue full of graffiti.
Both ads are very well done, except the woman sleeping in front of the statue would have been more effective with the statue alone; she seems to be posing for a fashion photoshoot.
Compassion Through Metaphors
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20 Innovations for the Homeless
Luxury for the Homeless (UPDATE)
Homeless By Choice
Sleeping in Bank Entrances