In most human languages, the speaker's body language can often provide
shades of meaning to what is being said, but such tends to be secondary -
that is, the fundamental meaning doesn't [usually] change; only things like
emotional context.

In speculative fiction, however, it is not unusual for a non-human language
to rely much more heavily on body language - examples that have been
mentioned here and in _Freelance Traveller_ would include the Jao (Eric
Flint et al in the trilogy beginning with _The Course of Empire_) and the
Zor (Walter H. Hunt in the _Dark Wing_ tetralogy). For these beings, body
language doesn't just provide shades of meaning; they can be in effect a
"second voice", and to fully understand what is said, a knowledge of both
"voices" is necessary.

How would the 'second voice' of body language be represented in writing?

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