I can only tell you that his presentation was a great ending to the conference. We traveled back through pre-literate human societies, where there was less to see, especially less manufactured stuff. Peter showed us how visual design evolved on ornaments and potteries, to become increasingly linear. But I won't say more, Peter spoke of unfinished work and working hypotheses, and I respect that.
However I can't resist to include a link to the gorilla experience on attention blindness by Simons and Chabris (1999): click here to try out (it takes a few minutes max and is very fun if you don't know the trick in advance). Peter referred to it at some point in his presentation, and it is very relevant to the theme of SEEING and (not-)KNOWING.
This is part of a series of posts on the 11th International Conference on Neuroesthetics (September 2014).