 As in Aristotelianism then, Kantianism claims that the human mind must itself have characteristics which are beyond nature, metaphysical, in some way.Specifically, Kant argued that the human mind comes ready-made with "a priori" programming, so to speak, which allows it to make sense of nature.Authors from Nietzsche to Richard Rorty have claimed that science, the study of nature, can and should exist without metaphysics.