From The Full Story:
The cell, and the world encountered by the cell, form a unity. The encounter between them is described by the perception/action relation. In that encounter, they are not separable. They are one.
and earlier, the Koan:
The wind was flapping a temple flag, and two monks were arguing about the flag. One said, “The flag is moving.” The other said, “the wind is moving.” They could not agree, no matter how hard they debated. The sixth patriarch, Eno, happened to come by and said, “Not the wind, not the flag. It is the mind that is moving!” The two monks were struck with awe.
This notion of a unity, that comprises subject and object, unifies the CSP view with that of Maturana. I think.