Yes that is what I was thinking Don. I am thinking the general thread underlying all of this is that we must keep alert to a dual level of "existence" - (1) the level on which we exist, which is very real to us, and in which we experience an "up or down" and at the same time (2) our understanding of the "global" picture in which our reality is not absolutely the same to everyone, but others have different ups and downs relative to their location.
To me at least one of the main parts of the significance of the line of reasoning is that it acclimates us to realize our own reality is important and yet that ours is not the only reality and we have to be aware of both.
As I am on the alert to campaign against nihilism what this signifies to me personally is that while we can agree with Democritus that if you drill deep enough you find nothing but atoms and void, that does not mean that the level at which we experience our world is less "real" or "important" or "meaningful" than the level of the atoms.
I don't think it's possible to keep an even perspective on both realities unless you're aware of this relationship so I see this as directly practical from that point of view.
So we keep aware that only the atoms have eternal and unchanging properties, but that from that basis we derive the changing qualities which we experience at our level of existence.
Joshua hit on this in the episode that we recorded two days ago, that that relationship between the properties and qualities would explain how some things are possible and some are not, the deepset boundary mark set forever between what can be and what can not.