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Concept

Among other things, Catch-22 is a general critique of bureaucratic operation and reasoning. Resulting from its specific use in the book, the phrase "Catch-22" is common idiomatic usage meaning "a no-win situation" or "a double bind" of any type. Within the book, "Catch-22" is a military rule, the self-contradictory circular logic that, for example, prevents anyone from avoiding combat missions. In Heller's own words:

There was only one catch and that was Catch-22, which specified that a concern for one's safety in the face of dangers that were real and immediate was the process of a rational mind. 'Orr' was crazy and could be grounded. All he had to do was ask; and as soon as he did, he would no longer be crazy and would have to fly more missions. Orr would be crazy to fly more missions and sane if he didn't, but if he was sane he had to fly them. If he flew them he was crazy and didn't have to; but if he didn't want to he was sane and had to. Yossarian was moved very deeply by the absolute simplicity of this clause of Catch-22 and let out a respectful whistle.
"That's some catch, that Catch-22," Yossarian observed.
"It's the best there is," Doc Daneeka agreed.

Other forms of Catch-22 are invoked throughout the novel to justify various bureaucratic actions. At one point, victims of harassment by military police (MPs) quote the MPs as having explained one of Catch-22's provisions: Catch-22 states that agents enforcing Catch-22 need not prove that Catch-22 actually contains whatever provision the accused violator is accused of violating. An old woman explains: Catch-22 says they have a right to do anything we can’t stop them from doing. This nightmare of a bureaucracy crushing the individual with absurdity is similar to the world of Kafka's 'Trial', and George Orwell's '1984', the concept of 'doublethink' having definite echoes in Heller's work.

Yossarian comes to realize that Catch-22 does not actually exist, but because the powers that be claim it does, and the world believes it does, it nevertheless has potent effects. Indeed, because it does not exist there is no way it can be repealed, undone, overthrown, or denounced. The combination of brute force with specious legalistic justification is one of the book's primary motifs.

The motif of bureaucratic absurdity is further explored in 1994's Closing Time, Heller's sequel to Catch-22. This darker, slower-paced, apocalyptic novel explores the pre- and post-war lives of some of the major characters in Catch-22, with particular emphasis on the relationship between Yossarian and tailgunner Sammy Singer.