In Wim Wenders film, Wings of Desire, Damiel and Cassiel are angels who move about freely in West Berlin of the 1980's, taking notes as they randomly eavesdrop on the thoughts, fantasies, rage and worries of everyday people. It is their mission to, "...assemble, testify and preserve reality." They are invisible to everyone except children, yet their presence has a soothing, pleasant effect on each person they sit next to, or pass on the street. They spend time with other angels at the Central Library; it is the most crowded place for thinking, and the clatter of learning is loud for their keen ears.
Among friends, workers, family or strangers, there are things we can't ever know.