"The dead are always looking down on us,
they say,
while we are putting on our shoes or making a sandwich,
they are looking down through the glass-bottom boats,
of heaven as they row themselves slowly through eternity.
They watch the tops of our heads moving below on earth,
And when we lie down in a field or on a couch,
Drugged perhaps by the hum of a warm afternoon,
They think we are looking back at them,
which makes them lift their oars and fall silent and wait,
like parents,
for us to close our eyes"

{Billy Collins; The Dead}