Whitehead's Eleventh Category of Explanation
The Eleventh Category of Explanation
That every prehension consists of three factors: (a) the 'subject' which is prehending, namely, the actual entity in which that prehension is a concrete element; (b) the 'datum' which is prehended; (c) the 'subjective form' which is how that subject prehends that datum.
A Little More Commentary
A living occasion is characterized by a flash of novelty among the appetitions of its mental pole...In a physical purpose the subjective form has acquired a special appetition -- adversion or aversion -- in respect to that eternal object as a realized element in that physical datum.