鋼鉄都市
Gunn cited examples of a more complex style, such as the climax of "Liar!". Sharply drawn characters occur at key junctures of his storylines: Susan Calvin in "Liar!" and "Evidence", Arkady Darell in "Second Foundation", Elijah Baley in "The Caves of Steel", and Hari Seldon in the "Foundation" prequels.