The idea of flux, kind of constant change, whether it be our sense of time or geological time or cosmic time. It's always there, and I think that maybe it's a way of dealing with the idea of mortality, trying to acknowledge the fact that all things change, and whereas, maybe death is the end of one state of being it's the beginning of something else. I'm not talking about going to heaven or being reincarnated as a toad, I'm talking about the idea that the molecules in our bodies, or at least the atoms, were here at the beginning of the universe, and the sense that we are basically matter.