My visit to Sussex University included attending the presentation of PhD student from UTS Lian Loke, titled, Movement & Meaning: A Study of iToy. The presentation was extremely interesting and introduced me to the area of lavanotation for the first time, an area of research by Lian and the Interaction Design and Work Practice laboratory at UTS.
Labanotation is a standardised system for analysing and recording human motion. I went looking for more information about labanotation on the Web and found an introduction on the standard.
The presentation by Lian also made me think for the first time, of the semantic aspects within interaction design.
Update: Wikipedia also has a page on Lavanotation and Symbols