But I want to make it clear: there is no such thing as silence.
And I know this sounds like the most pretentious TED Talk statement ever.
But even if you were to enter a room with zero reverberation and zero external sounds,
you would still be able to hear the pumping of your own blood.
And in cinema, traditionally, there was never a silent moment because of the sound of the projector.
And even in today's Dolby world, there's not really any moment of silence if you listen around you.
There's always some sort of noise.
Now, since there's no such thing as silence, what do filmmakers and sound designers use?
Well, as a synonym, they often use ambiences.
Ambiences are the unique background sounds that are specific to each location.
Each location has a unique sound, and each room has a unique sound, which is called room tone.
So here's a recording of a market in Morocco.
And here's a recording of Times Square in New York.
Room tone is the addition of all the noises inside the room: the ventilation, the heating, the fridge.
Here's a recording of my apartment in Brooklyn.