Abstract
The paper deals with such a modification of genuine modal realism as to accommodate
impossible worlds into its ontology. First of all, the theory of modal realism is
presented. Next, several motivations for the acceptance of impossible worlds are adduced.
Further, Lewis’s argument against impossible worlds is presented. It is argued
that the argument can be weakened by rejection of one of its premises. Finally, two
objections against the proposal are countered. Although my strategy accounts for the
Opinion concerning the impossible, it allegedly violates another Opinion which conceives
the reality classical. It seems, however, that there is no no-question-begging
reason to think that reality is classical. How can we know, after all, which logic describes
reality? Without a definite answer to the question, the incredibility objection
then simply collapses into a statement of a possibilist dogma.