An artist friend who had been there all day, briefly updated me. Trained as an architect, she is fascinated by the underlying structure and strength of the project. She said she was watching Patrick pulling a large sapling one way to give it form, which takes a terrific amount of strength, thinking to herself, why is he doing it that way? Then Patrick is binding other branches or saplings to the back, while moving others yet another way, and then the pattern suddenly reveals itself. It could be a vaulting or a cupola, or a widening or a tightening. With amazement, she says, “It emerges - you cannot even think it up in the mind. The spherical shapes are so complex and surprising.”
Here's a short video clip of the view from above, at the end of Day 9.