Abridged transcription of his talk about the different affordances of various media, especially books and screens. For the former, written text is foregrounded, whereas images are foregrounded for the latter.
R. Vilimek, T. Hempel, and B. Otto. Human-Computer Interaction: HCI Intelligent Multimodal Interaction Environments, 12th International Conference, HCI International 2007, Beijing, China, Proceedings, Part III, volume 4552 of Lecture Notes in Computer Science, Springer, Berlin, (2007)