The Irrationality of the Universe
Though The Stranger is a work of fiction, it contains a strong resonance of Camus’s philosophical notion of absurdity. In his essays, Camus asserts that individual lives and human existence in general have no rational meaning or order. However, because people have difficulty accepting this notion, they constantly attempt to identify or create rational structure and meaning in their lives. The term “absurdity” describes humanity’s futile attempt to find rational order where none exists.

Though Camus does not explicitly refer to the notion of absurdity in The Stranger, the tenets of absurdity operate within the novel. Neither the external world in which Meursault lives nor the internal world of his thoughts and attitudes possesses any rational order. Meursault has no discernable reason for his actions, such as his decision to marry Marie and his decision to kill the Arab.
Society nonetheless attempts to fabricate or impose rational explanations for Meursault’s irrational actions. The idea that things sometimes happen for no reason, and that events sometimes have no meaning is disruptive and threatening to society. The trial sequence in Part Two of the novel represents society’s attempt to manufacture rational order. The prosecutor and Meursault’s lawyer both offer explanations for Meursault’s crime that are based on logic, reason, and the concept of cause and effect. Yet these explanations have no basis in fact and serve only as attempts to defuse the frightening idea that the universe is irrational. The entire trial is therefore an example of absurdity—an instance of humankind’s futile attempt to impose rationality on an irrational universe.

The Meaninglessness of Human Life
A second major component of Camus’s absurdist philosophy is the idea that human life has no redeeming meaning or purpose. Camus argues that the only certain thing in life is the inevitability of death, and, because all humans will eventually meet death, all lives are all equally meaningless. Meursault gradually moves toward this realization throughout the novel, but he does not fully grasp it until after his argument with the chaplain in the final chapter. Meursault realizes that, just as he is indifferent to much of the universe, so is the universe indifferent to him. Like all people, Meursault has been born, will die, and will have no further importance.

Paradoxically, only after Meursault reaches this seemingly dismal realization is he able to attain happiness. When he fully comes to terms with the inevitability of death, he understands that it does not matter whether he dies by execution or lives to die a natural death at an old age. This understanding enables Meursault to put aside his fantasies of escaping execution by filing a successful legal appeal. He realizes that these illusory hopes, which had previously preoccupied his mind, would do little more than create in him a false sense that death is avoidable. Meursault sees that his hope for sustained life has been a burden. His liberation from this false hope means he is free to live life for what it is, and to make the most of his remaining days.

The Importance of the Physical World
The Stranger shows Meursault to be interested far more in the physical aspects of the world around him than in its social or emotional aspects. This focus on the sensate world results from the novel’s assertion that there exists no higher meaning or order to human life. Throughout The Stranger, Meursault’s attention centers on his own body, on his physical relationship with Marie, on the weather, and on other physical elements of his surroundings. For example, the heat during the funeral procession causes Meursault far more pain than the thought of burying his mother. The sun on the beach torments Meursault, and during his trial Meursault even identifies his suffering under the sun as the reason he killed the Arab. The style of Meursault’s narration also reflects his interest in the physical. Though he offers terse, plain descriptions when glossing over emotional or social situations, his descriptions become vivid and ornate when he discusses topics such as nature and the weather.