First, from Mumford and Son's "The Cave"
So come out of your cave walking on your hands
And see the world hanging upside down
You can understand dependence
When you know the Maker's hand
Now, the passage from Chesterton's Saint Francis of Assissi:
Francis, at the time or somewhere about the time when he disappeared into the prison or the dark cavern, underwent a reversal of a certain psychological kind...The man who went into the cave was not the man who came out again...He looked at the world as differently from other men as if he had come out of that dark hole walking on his hands...This state can only be represented in symbol; but the symbol of inversion is true in another way. If a man saw the world upside down, with all the trees and towers hanging head downwards as in a pool, one effect would be to emphasise the idea of dependence. There is a Latin and literal connection; for the very word dependence only means hanging. It would make vivid the Scriptural text which says that God has hung the world upon nothing.-Saint Francis of Assisi (1923)