I was thinking of something that involved everything in one place. The relationship between air and diaphragm, lung and body. In at least a gross sense (without the little holes, using a balloon + air flow direction model), I think your movement system could completely and fully describe it.
It needs a camera view. I don’t think of it’s possible to do a purely temporal description without a perspective. It may mean describing things twice for two objects, once for each temporal view, but it would work.
You could have an inbetween camera view that gets input “in stereo”
Describing the size of a fish using hands would be a good test for an inbetweenness description.