Grasp and Causality

When being grasped by a human, an object conforms to the contours of a hand.  Likewise, when being harnessed, an environmental process, e. g. a force, conforms to a human interest.  In other words, conformation-to is a novel modification that can be attributed immediately to only Formal Causality.  Now, in Whitehead's system, the 'Prehension' of an external object is a Feeling, i. e. a Sensation, and, hence, is fundamentally no more than an effect of Efficient Causality, i. e. a rudimentary passive reaction to an external influence, subject to subsequent Teleological mental modification.  Thus, his judgment that manipulation, e. g. controlled experiment, can be only a contrivance that is part of a mechanical sequence, is rooted in either an unawareness of the synonymity of 'grasp' and 'prehension', or an abstraction of Prehension from its fundamental physiological shaping operation.