The Invisibles

I remember years ago when I used to ride the bus to school. I once thought about the bus driver and his role in my life. All I knew about him was his first name. However, he sat at the front of the bus five days a week listening to everyone else's stories. He knew so much about us, while we knew nothing about him. How often we forget about the "invisible" people in our lives (i.e. janitors, secretaries, drivers, nurses, retail workers, etc).

To whom am I Invisible?