Perception and Repulsion

According to Kant, proof of the presence of a repulsive force in a space occupied by apparently immobile matter is resistance to penetration by an external force.  However, he does not further consider that such an external force is itself a repulsive one.  Hence, he does not entertain that insofar as any sense datum is experienced as filling a space, any act of perception is constituted by a subjective repulsive force encountering an objective one.  Nor is that thesis considered by most other Epistemological theories, which generally treat sensory processes as passively undergone, even Causal theories of perception.