In order to follow the instructions of the doctor I chose the road which followed not the hypotenuse but the two legs of a triangle. Soon I reached the road running along the Green Wall. From beyond the Wall, from the infinite ocean of green there rose toward me an immense wave of roots, branches, flowers, leaves. It rose higher and higher; it seemed as though it would splash over me and that from a man, from the finest and most precise mechanism which I am, I would be transformed into.⁠ ⁠… But fortunately there was the Green Wall between me and that wild green sea. Oh, how great and divinely limiting is the wisdom of walls and bars! This Green Wall is I think the greatest invention ever conceived. Man ceased to be a wild animal the day he built the first wall; man ceased to be a wild man only on the day when the Green Wall was completed, when by this wall we isolated our machine-like, perfect world from the irrational, ugly world of trees, birds and beasts.⁠ ⁠…