A person sitting still on the outside and not still at all: a foot swinging, a pen turning, a sleeve being twisted, a body shifting in a chair. Every movement is small, every movement repeats, and almost none of them are planned — the hands keep going while the mind waits. Hold that picture and the rest of the word follows, because English simply gives the same name to the movement, to the person who makes it, and to the little object made to receive it.