Quote from "For One More Day" 2

p.193-194

"What causes an echo?" she once quizzed me.
The persistence of sound after the source has stopped.
"When can you hear an echo?"
When it's quiet and other sounds are absorbed.
When it's quiet, I can hear my mother's echo still.

if it's not quiet, we can't hear anything...
try not to keep yourself busy. sit down and listen. sit down and watch. you'll see a lot out there.