OK. I’m working (for free) on a small but very tasteful commercial for a major world charity. The sound is subtle but significant. At the very end of the ad, the pictures fade to black, and a simple piece of explanatory text appears.

This morning I’m playing what I’ve done to the director, an awfully nice but very intense chap.

“So, what do you think for the end when we fade out, then?” he asks.

“Oh, I dunno. Silence I guess. I thought that worked pretty well. Unless you want some other kind of thing there…”

He looks deeply thoughtful, and runs his hands through his hair.

“I was thinking, rather than silence, maybe we could just have, you know, the sound of nothing.”

“Uh-huh,” says I. “And that would be different to silence in exactly what way?”