The notion of pun comes from pull back: re-barter (change). The term is used to refer to the pun that is generated from a repetition.
For the rhetoric, the pun specifically consists of present the terms of one proposition and then reverse them in the next, in such a way that the meaning of the second clause is opposite or produces a contrast.
In this case, the pun is built with a chiasmus, which involves arranging the members of consecutive sequences in the reverse order. Therefore the pun rearranges the components of an expression in the next sentence.
We can find many puns in the field of music. In the song “Pedro navaja”, to mention one case, the Panamanian Ruben Blades uses the pun when expressing: “Life gives you surprises / surprises gives you life”.
Another phrase constructed with a pun is “One for all, all for one”, which comes from the Latin “Unus pro omnibus, omnes pro uno”. Alexander dumas, for example, he uses it in his famous construction site “The Three Musketeers”.
There are aphorisms that also appeal to the pun. “We seek the beauty of life. But life is already beauty “ is an aphorism of the Argentine writer Jose Narosky which is based on this kind of word game.
Sometimes the pun lets you simplify a idea or make it explicit. In this way, this resource can appear in the colloquial language, even spontaneously: “I work to live, I do not live to work”, “I’m sick of being fed up”.