Theatre of the Absurd plots of many Absurdist plays feature characters in interdependent pairs, commonly either two males or a male and a female. Some Beckett scholars call this the "pseudocouple". The two characters may be roughly equal or have a begrudging interdependence (like Vladimir and Estragon in "Waiting for Godot" or the two main characters in "Rosencrantz & Guildenstern Are Dead"); one character may be clearly dominant and may torture the passive character (like Pozzo and Lucky in "Waiting for Godot" or Hamm and Clov in "Endgame"); the relationship of the characters may shift dramatically throughout the play (as in Ionesco's "The Lesson"
Samuel Beckett Days" (1961). These plays—which are often considered, rightly or wrongly, to have been instrumental in the so-called "Theatre of the Absurd"—deal in a darkly humorous way with themes similar to those of the roughly contemporary existentialist thinkers. The term "Theatre of the Absurd" was coined by Martin Esslin in a book of the same name; Beckett and "Godot" were centerpieces of the book. Esslin argued these plays were the fulfilment of Albert Camus's concept of "the absurd"; this is one reason Beckett is often falsely labeled as an existentialist (this is based on the assumption that Camus was an existentialist,