The thesis that each of our beliefs and assertions is either true or false, if it is to be at all plausible, requires two qualifications, qualifications most adherents of the Common Western Metaphysic will be willing to make. Anti-Realism, rather, is a denial of the possibility of metaphysics, since the very enterprise of metaphysics is the attempt to discover the nature of ultimate reality. And Realism is a metaphysic only in the sense that it is a thesis common to all metaphysical theories. The anti-Realists have ascribed various features to anti-Realism, and many of these features are clearly taken by the anti-Realists to be essential to anti-Realism: any thesis that did not have those features would not be anti-Realism.