 So far, Schopenhauer’s view is similar to Kant’s. But Schopenhauer does something Kant would not do. He makes a further positive proposal about the nature of the absolutely intrinsic properties that underlie the orderly arrangement indicated by natural causal explanations. Specifically, in his view the will plays the key role: “indeed the answer to the riddle is given to the subject of knowledge who appears as an individual, and the answer is will” (1818: Vol. 1, Bk. II, sect. 18, par. 1 [1961: 115]). The absolutely intrinsic properties in which the orderly arrangement of the world of appearance is grounded are volitional—and hence the title of his famous book (Schopenhauer 1818: Vol. 1, Bk. II, sect. 18, par. 1 [1961: 115]; see the entry  Arthur Schopenhauer).