I would also say that this idea can be extended to our own personal core. When I consider where I am now, many of the ideas of how I wanted to shape my life grew up out on the edge of my imagination, far out ideas that maybe I'd get around to eventually. And then something remarkable happened - those ideas on the edge grew to such a size that they demanded more attention. It was a snowball effect - the more attention they were given, the more refining I could do, and the more plausible they seemed despite the fact that originally they seemed impossible to achieve.
This is the wonderful thing about imagination and the belief that even the at-first impossible tasks or dreams take on the glow of possibility if tended to long enough. They somehow sprout a life of their own. It's as if in time they grow legs and walk themselves to the middle of your existence so you can better see them and consider them. So pay attention to the edges; they are slowly marching to center stage to have their day.
The above picture can be found at: http://www.thebest3d.com/dogwaffle/tuts/o2/glow-onCircle.jpg