Chugalug,
This still leaves me intensely curious. I'll take you up on:
...I'm sure that a media luvvie would be able to explain it in a trice..
We must have IT graphic experts (not necessarily "luvvies") in earshot on this Thread. Come in on this, please - after all, it's not every day you see some graven images on a ancient Egyptian stone block moving about while others remain stationary.
Meanwhile Professor Fletcher continues her lecture, seeming not to notice what is taking place (although the first movement appears on the wall at 07.13, while she is walking out of shot), and movement continues till 0728.
I'm surprised that you seem to be alone (with me) in finding this of interest !
Cheers, Danny.