I had the good fortune of taking a class once upon a time with the Bonsai Master Frank Okamura at the Brooklyn Botanic Garden. He considered the cultivation of Bonsai to be a mystical pursuit.
It represents the connection between Man, God and Earth. That point remains indelibly crystal clear to me even after all these years from his kind and expert instruction.
Between Heaven and Earth grow people and trees. But the trees, he said, are the crucial link. The Bonsai grower must communicate with the tree, which communicates with God.
So, where's the center line?
The center line is reserved for the Deity to descend and admire the beauty of mortal work.