To most people living in cities around the world, the homeless have essentially become invisible. They blend into the streets, they're background noise, they're just a part of the fabric of a city, like buildings and street lights. To prove how invisible the homeless are to normal decent folks, NYC Rescue Mission did a social experiment where they dressed people's family members as homeless to see how they would react.
Everybody just walked by without saying a word to their family, some never even gave a glance to their relatives.
The clip gets a bit heavy handed, but if you can ignore that, the NYC Rescue Mission wants to do something to help out the homeless.