Underground confidential

Nothing morbid here.  It is more about the line between vegetation and dirt/earth.  Here what I am talking about:

It look very separate on the photo.  I find it very interesting to see it in that way.  It look like looking things on the microscope.  No need to see a drawing on how this work, I can see it from my own eye, naturally.  Some small animals can go under the trees and have a place to stay.  I am sure there is some interesting lives that dwell there.

I can easily imagine a mythological world with mythological being living there too.  I know it would be only in my imagination.  Well, it can be the starting point for a new story...