LC:
The stillness often referred to in the classics is not necessarily the kind of stillness one associates with little or no movement. [Considering the classics as personal antecdotes], stillness must really mean stillness - inside! A calmness. I once heard this described as - "heart calm". I have since come to use the expression to encourage my students to "go inside" just before they begin the form. I believe there can be very "large" calm or stillness when the body is busy openning and closing.

TC:
I think I recognize that the classics are speaking of the mind, but I keep also thinking that somehow the body should reflect the mind. I'm toying with watching myself do the movements, now, and perhaps I'm getting an inkling that a flitting body may really be a reflection of a still mind. Like turning up the gain on an amplifier such that the faintest whispers rock the house, which takes a very quiet system (and acoustics that prevent feedback!).