  By contrast, Rickert and the Southwestern Neo-Kantians emphasize the ultimate irreducibility of what is given in intuition to conceptual forms. While everything can be grasped by concepts, and therefore no domain of reality and cultural life eludes in principle conceptual mastery (pan-archy), nothing can be grasped exhaustively by concepts, and therefore our rationality has to constantly take into account an irrational residue intrinsic to every conceptual construction. To conceptualize, for Rickert, is to recast the materials delivered immediately by the senses into a conceptual form. In so doing, we necessarily have to be selective, that is, we have to leave out of consideration an overwhelming amount of elements and take up in our conceptuality only those elements that match the criteria originally established for the purpose of solving our theoretical task. To give a simple example, in order to conceptualize, say, linear motion we have to isolate from the overwhelming amount of data stemming from the senses only those features that pertain to the movement of bodies (spatial location, speed, reciprocal position, etc.) and leave out of consideration everything else. This general characterization can serve as a prelude to Rickert’s theory of knowledge, which is the theme of the next section.