I’m a sucker for these models of a messy real world thing that attempt to explain it all; particularly if they include a drawing.
Anecdote of the Jar
I placed a jar in Tennessee, And round it was, upon a hill. It made the slovenly wilderness Surround that hill. The wilderness rose up to it, And sprawled around, no longer wild. The jar was round upon the ground And tall and of a port in air. It took dominion every where. The jar was gray and bare. It did not give of bird or bush, Like nothing else in Tennessee.