You are returning from work at night, walking through the streets when you pass near a small bar, almost imperceptible. Inside it resonates a beautiful violin sound that attracts your attention. You enter the small bar and find a lone violinist playing only for himself as the bar is empty. The music and the way he plays is very beautiful, but there is no one to appreciate it. You sit silently in a chair to enjoy the music without attracting attention or disturbing the violinist.