Any view that postulates two kinds of thing in some domain is dualistic; contrasting views according to which there is only one kind of thing are monistic. The most famous example of the contrast is mind-body dualism, contrasted with monism in the form either of idealism (only mind) or more often physicalism (only body or matter). Cartesian dualism is the cluster of views about mind and body associated with Descartes. Other dualisms include those of form and content, of concepts and intuitions, freedom and causation, being and becoming, reason and passion. In every case there are philosophers who insist that the way forward is to transcend these dualisms.