Dumy Moyi, Carriageworks, Sydney, September 30; Departures, Ken Unsworth Studio, Sydney, October 1. In the recent exhibition of dance and the moving image 24 Frames per Second, staged beautifully and expansively at Sydney’s Carriageworks, I kept returning to one work. It was François Chaignaud’s The Sweetest Choice, a suite of five films, each eight or nine…