You must visit this site. It’s not the people are invisible, but we are blind. “Have they not traveled over the land so that they may have hearts by which they may apply reason, or ears by which they may hear? Indeed it is not the eyes that turn blind, but the hearts turn blind —those that are in the breasts!” (22:46)
I once heard a story about a homeless man on Hollywood Blvd who really thought he was invisible. But one day a kid handed the man a Christian pamphlet. The homeless guy was shocked and amazed, “what! You can see me? How can you see me? I’m invisible!”