This piece for flexible ensemble has had many performances over the years. I’ve posted two videos of performances below, and a bandcamp link where you can hear the audio of what I think was the world premiere, by CoMA South.
http://v.youku.com/v_show/id_XMzE2NDA0NDU2NA==.html?spm=a2hzp.8253869.0.0
http://v.youku.com/v_show/id_XMzE2NDA0MzQ3Mg==.html?spm=a2hzp.8253869.0.0