 Scholars are divided about the significance of the arguments in support of a constructivist interpretation of Kant’s theory of practical reason, even though nobody denies that, for Kant, the laws of the mind are laws of reason (compare Guyer 2013 and Engstrom 2013; Bagnoli 2013b). The most general source of reservations about the constructivist interpretation is that constructivism builds upon the critique of realism, but Kant’s claims about objective moral knowledge seem best vindicated by moral realism. In this dispute, constructivism is generally taken to be a form of antirealism (Ameriks 2003: 268, 274; Wood 2008: 108, 337, 374–375). It should be noted, however, that Rawls introduced Kant’s constructivism as a novel alternative to both realism and antirealism, where the latter includes subjectivism and relativism (Rawls 1980; O’Neill 1989a: 1; Engstrom 2013: 138ff).