His concerns are evident from individual stories such as "Hell-Fire" and "Silly Asses", as well as from the semi-habitable post-nuclear Earth depicted in Pebble in the Sky and The Stars, Like Dust.
Silly Wizard | Silly | Silly Symphonies | The Silly Pillows | Very Silly Songs! | The Ministry of Silly Walks | Silly String | Silly (song) | Silly Love Songs | Silly-en-Gouffern | Silly (band) | Silly Asses |