What are you thinking of? I thought those were by far the coolest, even if not oldest. (I haven't seen that before, didn't realise it was so common as you say.) Partly because they are absolutely identifiable in a way that the humans and pig.. really isn't to a layman, but also it's just so personal, much more of a 'connection', to me anyway, to the person who did it. The 'someone was actually there tens of thousands of years ago, painting around their hand, and now I'm looking at it' feeling hits a lot harder.
