 Undoubtedly, other objections to impossible worlds can and are likely to be raised. The current debate on impossible worlds appears to be at the same stage as the one on possible worlds was, some forty years ago. At that time, people struggled to make sense of the concept of a possible world. Many declared it meaningless. Nowadays, the variety of its applications has placed the notion firmly at the core of much philosophical and logical practice (see e.g., Divers 2002, Chapter 4). Impossible worlds may undergo the same fate, should they prove as useful as they appear to be in the treatment of impossibilities of various kinds.