“pure (without admixture of anything empirical), and yet are in one aspect intellectual and in another sensuous.”[923] Or as Kant describes the process in the chapter before us:[924] “We name the synthesis of the manifold in imagination transcendental, if without distinction of intuitions it is directed exclusively to the _a priori_ combination of the manifold; and the unity of this synthesis is entitled transcendental, if it is represented as _a priori_ necessary in relation to the original unity of apperception. As this unity of apperception conditions the possibility of all knowledge, the transcendental unity of the synthesis of imagination is the pure form of all possible knowledge. Hence, through it all objects of possible experience must be represented _a priori_.” The schemata, thus transcendentally generated, are represented by Kant as limiting and controlling the empirical processes of apprehension, reproduction, and recognition. As no experience is attainable save in terms of the schemata, they enable us to determine, on _a priori_ grounds, the degree of constancy and regularity that can be securely counted upon in all experience. This is Kant’s psychological explanation of what he has entitled “objective affinity.”[925] The empirical ground of reproduction is the association of ideas; its transcendental ground is an objective affinity which is “a necessary consequence of a synthesis in imagination, grounded _a priori_ on rules.”[926]