something which has no substance other than an apparent visible intention (possibly not intended seriously)
I'd sooner die than misrepresent the work of the Egregious Eight, but I do want to point out a few things in response to RT:
1. Horizontally, if you will, "gesture" can be–and, on the turf of the Egregious Eight, often is–an information-carrying stratum in which transformations of a single gesture, for example, and relationships between different gestures have developmental significance. In other words, the physical gestures (and, necessarily, the sounding results) are capable of presenting an
unfolding, just as sound (i.e. divorced from gesture) can.
2. Vertically, on the other hand, gestures are things that we do all the time in everyday life, so naturally gestures on the stage (whether holding a skull or playing the flute) are packed with associative connotations, some specific (e.g. a "casting a fishing rod"-type gesture) and some quite general (e.g. a "violent" gesture). These connotations are sometimes "consonant" with and sometimes at odds with the sound that they produce.
I'm sure corrections, if any are in order, will be forthcoming, but I hope this isn't too distorted. Or too obvious.