 book for the data. So it was kind of interesting to see the early views were very much from the river and then it started to shift up to the rim. So, I mean, you've talked about the Grand Canyon as two things, right? Like at the same time, a real place as well as an abstraction, right? And there are a lot of layers to that. But tell us, first of all, what do you mean by that? Like, how is it both of these things? And in what ways is it an abstraction? Yeah.