One of the few passages that actually mentions topology. I think I get what he's saying. A form that has no inside, sounds like the Japanese inhabit an experiential Klein bottle. Which doesn't sound very habitable! But he is saying that the deemphasis on private desires and the inwardness of soul in favor of external form is actually liberating, more playful.
A Klein bottle might be an icon of nonduality – a strangely twisted surface that has only one side, and thus fails to carve space into an inside and outside while seeming like it should. I can't be the first to make that connection, it sounds like something out of Hofstadter’s Gödel, Escher, Bach.