In this world we live in, equally cruel and beautiful, sometimes we want simple human warmth literally out of the blue, when we least expect it. It's a feeling that seems almost forgotten these days. That is why, when we encounter something like this, we are invariably surprised. For example, a few years ago, on the streets of London, one could see manifestations of a wonderful initiative - some uplifting messages addressed to anyone, including you and me. Small, large and simply huge - they