Postgate had strict views regarding storylines, which perhaps limited the possibilities for series development. When asked if the "Clangers" adventures were quite surreal sometimes, Postgate replied: "They're surreal but logical. I have a strong prejudice against fantasy for its own sake. Once one gets to a point beyond where cause-and-effect mean anything at all, then science fiction becomes science nonsense. Everything that happened was strictly logical, according to the laws of physics which happened to apply in that part of the world."