Scrying the aethyrs - change at NIA, why? Options

When scrying the aethyrs from TEX to NIA, there seems to be a fairly steady line of developments in which you could almost write a continuous story from it, but it changes when you get to NIA, I have been trying to understand why before I proceed.

Will it only become clear after I proceed?

Does it seem to change a lot for everyone at NIA or does the story change for some people on other aethyrs?

Is it different each time you start the journey from TEX?

Would prefer answers from members who have actually done this rather than mere speculation please.

Over a lifetime I believe that we work slowly through each aethyr although it seems possible that we return to some whilst working on others - I have no idea where I am at over the lifetime scale, but whilst doing some meditations with them, I did notice that there were very noticeable changes at certain points where the 'story' if you like seemed to turn a corner and one of these meditations where this happened was at BAG and then I noticed another at NIA; I have not meditated further than this yet.

I am wondering why the change is so dramatic at some points and if those points are a big leap for everyone or if different people find them at different places.

Also, if we are walking much of it in smaller samples throughout the overall journey, do we get stuck at the same points each time?

I see the aethyrs as a continuous pattern of growth where we go around several or even more times until we finally do them for the last time and clear out the imperfections of the other times. Whether that happens in one lifetime I have no idea or even if in reality, we only really do the journey once; I am hoping there are others here who experienced them and have an opinion on the above; so fire away Bym (IMG:style_emoticons/default/smile.gif)