(Thanks to Tom for suggesting fractals as another example)
In ecosystems, and most other systems, the edges are often the most rich and fertile.
We have the land ecosystem, and then the ocean ecosystem, and at the edge between the two there are representatives for both, and for the edge as well. Instead of characteristics from only one system, there are three: one, the other, and whatever emerges uniquely in the intersection of the two.
And so it is with awakening as well.
We have one system which is the awakened one. Another, which is the deluded one (taking oneself as a separate self). And at the edge of the two, there are characteristics of one, the other, and the uniqueness of the edge.
We get to explore a rich landscape, spanning all three ecosystems.
(In systems language, the awakened and deluded situations are attractor states, habitual states the system falls into… but in in this ecosystem analogy, it fits better to think of them as different landscapes or systems.)