 While Kant’s theory of mathematical concept construction can be thought of as providing an explanation of mathematical practice as Kant understood  it[2],  the theory is intertwined with Kant’s broader commitments to strict distinctions between intuitions and concepts, as modes of representation (Smyth 2014); between synthetic and analytic judgments (Anderson 2004, 2015; Hogan 2020); between the roles of different cognitive faculties (Land 2014; Laywine 2014); and between a priori and a posteriori evidence and reasoning (Anderson 2015). Ultimately, the picture of mathematics developed in the “Discipline of Pure Reason in Dogmatic Use” depends on the full theory of judgment that the Critical philosophy aims to provide, and crucially on the theory of sensibility that Kant offers in The Transcendental Aesthetic (Parsons 1992; Carson 1997; Risjord 1991), as well as in corresponding passages in the Prolegomena’s Main Transcendental Question, First Part, where he investigates the “origin” of the pure sensible concepts of mathematics, and the “scope of their validity”  (A725/B753).[3]