A Pun means playing with words that sound alike or have more than one meaning. Therefore, 'single' and 'sole' are used as puns in these lines. A pun adds a comedic effect and a sense of irony to the passage. Sometimes it also creates a mockery effect in the passage.
<h3>What is a Pun?</h3>
A Pun means to use the meaning of the words interchangeably to crack a joke or to make a satire.
William Shakespeare has used single and sole as a Pun here. Mercutio is saying that Romeo has cracked a silly joke, the fine skin of the pump (shoes) is all worn out, and the joke is the only thing he is left with. This has created a sense of humor and comedic effect in the passage.
Therefore, 'single' and 'sole' are used as puns in the passage which are creating a humorous effect in the passage.
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D. Intended to show feeling
The plausible assumption was that there must be a single location where all information about our internal conditions and environment is made available, decisions are taken and actions are initiated. Even Descartes—who considered mental processes to be superior to, rather than connected to, material processes in the brain, and whose free-floating res cogitanswould therefore have needed no circumscribed location—did not believe that it was possible to get by without a singular localizable controlling entity.