Full Idea
Conceivability may well be a guide to possibility, but literary fantasy is by itself no evidence of conceivability.
Gist of Idea
Conceivability may indicate possibility, but literary fantasy does not
Source
Achille Varzi (Mereology [2003], 2.1)
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.5
A Reaction
Very nice. People who cite 'conceivability' in this context often have a disgracefully loose usage for the word. Really, really conceivable is probably our only guide to possibility.