The instinct of self-deception in human beings makes them try to banish from their minds dangers of which at the bottom they are perfectly aware by declaring them nonexistent, and a warning such as mi...
Sometimes things happen that give me cause to believe I no longer exist. Car park barriers which do not lift when I drive towards them, automatic doors which do not open automatically as I approach.
(a.) Not having existence.
Simply minding one's own business is more offensive than being intrusive. Without ever saying a word one can make a person feel less-than.