Chekhov is reserved in his use of imagery in settings. For the most part, he is spare in his descriptions, but on specific scenes, he uses detailed imagery to express the importance of the scene.
Symbolism can be found in his depiction of nature versus civilization. Scenes featuring a natural landscape setting symbolize purity of truth and emotions, whereas, civilization symbolizes the corrupt, superficial aspects of human nature.
Morality is a theme in the novel, and is explored by detailing the morals and values depicted in a person's actions, and the questioning of moral consequences because of those actions.