As I was reading, I found this excerpt from Zen ni kike of Kodo Sawaki. I could not resist putting it on this blog. To my foolish ears, it sounds that what Kodo is talking about is the formless field of happiness, zazen-kesa, kesa-zazen:
"Life doesn't run on tracks. Birdsong knows neither major nor minor. Boddhidharma's teaching doesn't fit on manuscript paper. The Buddha-Dharma is unlimited. When you try to hold it still, you miss it. It isn't dried cod. Living fish has no fixed form".