People should be a little loony, Helena. That's the best thing about them. ~ Karel Čapek

 K.Čapek wrote with intelligence and humor on a wide variety of subjects. His works are known for their interesting and precise description of reality. Čapek is renowned for his excellent work with the Czech language. He is known as a science fiction author, who wrote before science fiction became widely recognized as a separate genre. Capek can be considered as one of the founders of classical, non-hardcore European science fiction which aims on possible future (or alternative) social and human evolution on Earth. However, K.Čapek is comparable with Aldous Huxley and George Orwell as a speculative fiction writer, distinguishing his work from genre-specific hard science fiction.

Many of his works discuss ethical aspects of industrial inventions and processes already anticipated in the first half of the 20th century. These include mass production, nuclear weapon, and post-human intelligent beings such as robots or salamanders.

Čapek also expressed fear from social disasters, dictatorship, violence, human stupidity, the unlimited power of corporations, and greed. Capek tried to find hope, and the way out. Čapek's literary heirs include Ray Bradbury, Salman Rushdie, Brian Aldiss, and Dan Simmons