An idea posited by this philosopher has been explained by scholars via the “two aspects” and “two worlds” interpretations. In one text, this philosopher argues that certain (15[2])concepts he analyzes are objectively valid because experience and apperception are only possible through them. This philosopher asserted that morality and freedom are reciprocal through his “reciprocity thesis.” (15[1])This philosopher said (*) space is not an empirical concept (10[1])and argued we only know the world through its appearances and not through the noumenal (10[1])“thing-in-itself.” (10[1])This philosopher (-5[1])argued (10[1])that only maxims that can be willed as a universal law are morally permissible through a categorical imperative and, (10[1])in one book, discussed synthetic a priori propositions. For 10 points, name this German enlightenment (10[1])philosopher of transcendental idealism and the book Critique of Pure Reason. ■END■