Disordered Nodes

[epsi1on]

I've tried to create an rtree of 155K shapes (instance of class Shape), this is visualization of bounds of lowest nodes which each nodes just have one Shape:

I went one level upper and i've got this visualization!:

I'm not sure but i was expecting some order like this:
http://mourner.github.io/rbush/viz/viz-cluster.html
As your library is port of RBush.