This is an absolutely brilliant idea! The New York charity Pathways to Housing wanted to raise awareness of the problem of homelessness so they tried a new approach. For three evenings they projected the image of a homeless man sleeping on the sidewalk and shivering in the cold in downtown Manhattan. Words also projected on the side of a building asked people walking by to send a text message to help get him off the streets.
When someone sends a message, it triggers a new video and the man gets up. This is a great approach.