Visual representation (Alan Blackwell's research theme)

I only have one big research question, but I attack it from a lot of different angles. The question is representation. How do people make, see and use things that carry meaning? The angles from which I attack my question include various ways in which representations are applied (including design processes, interacting with technology, computer programming, visualisation), various methods by which I collect research data (including controlled experiments, prototype construction, ethnographic observation), and the theoretical perspectives of various academic disciplines (including computer science, cognitive psychology, engineering, architecture, music, anthropology).