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On a tangent: Quintilian has an interesting chapter on the use of gesture in rhetoric, and he denounces imitative gesture (and especially imitative voice) as being infra dig, while lauding more abstract gesture as a side channel to breadcrumb the separate parts of a speech and their various relations to the current line of argument.

https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Quintilia...

> "It was for this reason that Demosthenes used to practise his delivery in front of a large mirror..." et seq

(On the importance of glances, when not hidden by a spacesuit helmet: the soviet equivalent of Sesame Street used puppets with mobile eyes, which I find very expressive indeed.)