there is freedom only in a situation, and there is a situation only through freedom... There can be a free for-itself only as engaged in a resisting world. Outside of this engagement the notions of freedom, of determination, of necessity lose all meaning
Earlier in 1939, in his short story The Childhood of a Leader, collected in his famous The Wall, referring to a fake turd, he said that in pranks "There is more destructive power in them than in all the works of Lenin." Another famous use of the term was in 1945, in his editorial of the first issue of Les Temps modernes (Modern Times); arguing the principle of the responsibility of the intellectual towards his own times and the principle of an engaged literature, he summarized: "the writer is in a situation with his epoch."
An, influential use of the concept was in the context of theatre, in his 1947 essay For a Theatre of Situations. A passage that has been frequently quoted is the following, in which he defines the Theater of Situations:
if it's true that man is free in a given situation and that in and through that situation he chooses what he will be, then what we have to show in the theatre are simple and human situations and free individuals in these situations choosing what they will be.... The most moving thing the theatre can show is a character creating himself, the moment of choice, of the free decision which commits him to a moral code and a whole way of life.
He then published his series Situations, with ten volumes on Literary Critiques and What Is Literature? (1947), the third volume (1949), Portraits (1964), Colonialism and Neocolonialism (1964), Problems of Marxism, Part 1 (1966), Problems of Marxism, Part 2 (1967), The Family Idiot (1971-2), Autour de 1968 and Melanges (1972), and Life/Situations: Essays Written and Spoken (1976).
Sartre's concept of Situation was reprised by Guy Debord at least since the times of the Letterist International. In January 1954, the Letterist International declared: "The new beauty will be that of THE SITUATION, that is to say, provisional and lived."
Claire Gilman called Sartre a "father figure" for the Situationist International, and wrote that "Sartre and his philosophy of the situation are fundamental to the SI's notion of everyday life authentically experienced". The relationship between Sartre's philosophy of the situation and the Situationist International is clarified by Peter Wollen in his essay Bitter victory.
What particularly surprised Lucien was the enormous quantity of practical jokes Bergere had accumulated on a shelf: solid liquids, sneezing powder, itching powder, floating sugar, an imitation of a turd and a bride's garter. While Bergere spoke, he took the artificial turd between his fingers and considered it with gravity. "These jokes," he said, "have a revolutionary value. They disturb. There is more destructive power in them than in all the works of Lenin."
Bergere's room boasts a hotchpotch decor of Surrealist curios, which his new mentor informs his disciples have greater revolutionary clout than the complete works of Lenin. This is a self-evidently ludicrous claim, further undermined by the revelation that Bergere's idea of revolution is to slip itching-powder into a whore's bed.