Consider what is exchanged when we speak. We exchange symbols with associated meaning.

The symbols, those are clear enough, but the meaning, that’s assumed.

So there is that large assumption that I mean what you mean.

With dead-common subjects it’s a safe assumption. With strange subjects the assumption might prove false. Most subjects will fall in the middle somewhere. The assumption will, to some degree, fail. But we will probably pretend that it didn’t or simply neglect to consider the possibility.

So there is an unrecognized degree of failure to convey meaning there. A kind of noise.

And that noise compounds every time the words pass from person to person.