Salmon extends this view to what he calls "mythical objects", like the hypothetical planet, Vulcan. Vulcan really exists, but it is not a real planet. It is an abstract entity that is only depicted as a planet in the myth. Salmon's account of fiction and myth thus has direct application to the philosophy of religion. Salmon has also applied his account of mythical objects to Peter Geach's famous problem of uncovering the logical form of the particular sentence, "Hob thinks a witch has blighted Bob's mare, and Nob wonders whether she (the same witch) killed Cob's sow". Salmon's account shows how the problematic sentence can be true even though there are no witches, and even if Hob and Nob do not know about each other, and there is no one whom they think is a witch.