A familiar sound can remain unnoticed for a long time, and then suddenly become clear.
The sound itself has not changed.
A door closing somewhere nearby. A passing car. Water in pipes. Steps in another room. A clock that has been there all along.
These sounds often belong to the background.
They repeat without asking to be heard.
Then one of them appears differently.
Not louder. Not closer.
Only more distinct.
It separates from the rest of the moment and becomes briefly noticeable, as if it has stepped out from behind everything else.
For a short while, the sound seems to have its own place in the room or in the day.
After that, it settles back again.
The background closes around it, and the familiar scene continues in the way it had before.