<DIV><i>Imagining Irreality</i> looks at the various ways philosophers have considered the realm of unreal possibilities and nonexistent objects. Author Nicholas Rescher ties both diverse approaches and makes an argument against the philosophical trend of dealing with nonexistent possible worlds as though they were authentic objects. He does not attempt to show that no Platonic realm of possibilities can exist, but merely that philosophers can discuss and think about unrealized possibilities without recourse to such a realm.</div>