The Wandering Crystal Sphere [Dark Sun]

Ok, I've talked about this before, but I have this idea that the Athasian Crystal Sphere travels through the Prime Material Plane on an inclined orbit; at times it is close to Water and the Positive plane, descending close to Earth and relatively equidistant between Positive and Negative, then down to Fire and Negative, before heading up through Air.

The Blue Age ended in the 8th Worlds (King's) Age; the Red Age began when Rajaat used the Dark Lens in the 144th King's Age. At 77 years per age, that means that each Age is roughly 10,500 years long (I'm fudging a bit for roundness sake).

That means that (In KA 191) FY 1 is about 3,600 years into the Red Age. This means there's about 7000 more years of the Red Age, followed by what I will declare the Yellow Age, just because it is an easy color to use. The Yellow Age will see a reduction of undead (as we move away from the Negative Material Plane), but other than that? Who knows? A resurgence of life shaping? In its 42,000 year cycle (assuming their hypothesis is true), do things repeat? Does the next Blue Age see halfling life-shapers? Maybe humans rise to the top? Might thri-kreen be survivors of a previous Green or Red Age, who suffered through the Blue Age?

This is all speculative, of course. Just a neat cosmological idea.