The smoke ring

The Smoke Ring is a science fiction novel by Larry Niven that explores the concept of a vast, toroidal world that exists in a unique environment, where the inhabitants face challenges and adventures in their quest for survival and understanding.

In The Smoke Ring, a group of characters navigates the complexities of a world shaped by its unique physics and environment. The story delves into themes of exploration, survival, and the nature of existence within a closed ecosystem.