There is Amber, the only real place, of which other worlds are but shadows. There are also the courts of Chaos, ever changing, easily molded. Then there is Abyss, from which (almost) nothing has ever returned.
One way to think about it would be to take Pattern as the center of order and stability and lack of change, while have Logrus represent change and instability. But Abyss clearly is emptiness, which is totally unchanging, and still Abyss lies close to the Courts, which seems suspicious.
So I would have Abyss be emptiness while Logrus is everything. They are very close to each other, since neither can separate things from each other: None lie in Abyss, while all of them are in Logrus. Pattern, then, is structure – very far from nothing and everything. This is how an Amberite might see the situation.
But what of the Chaosite perspective? Certainly nothing is the ultimate in structure, for it (vacuously) has all the structure imaginable, and so Abyss must lie somewhere behind Pattern and Amber, if looked at from Chaos.
What of the Abyssian point of view? Well, it is empty, so there must be nobody looking, and so the issue is moot.
And what of Corwin’s pattern? Suppose it is another center of order. Is it compatible with the pattern of Amber, or do they simply not interact at all, or are their conceptions of order constantly struggling? And how does all of that look from whichever perspective one takes?
This all reflects on the use of powers when moving through Shadow. By Pattern-walking both Abyss and Logrus are distant from Amber, but maybe for the Chaosites, however they move, both Pattern and Abyss are distant places. Or do some Chaosites wield the powers of Abyss, or do some other entities? Then, for them, both Logrus and Pattern would be far, however they move.
Yet, as a further complication, it is tedious to shift Shadow near Amber. What of the other powers, and how well does Pattern work near the other centers of power? What of Corwin’s pattern, and initiates to it?