Ever since e. e. cummings broke into the vault of traditional English poetry stored well into the twentieth century, poets seem to think punctuation does not matter much. Does it? Maybe not to everyone, but poets and writers who want to be understood will find that punctuation helps their readers to keep up and follow the general gist of what's being said.
Used effectively, punctuation directs your readers much like traffic signs provide directions for vehicles and pedestrians. For example, think of using a comma like a yellow caution light to slow down your readers without bringing them to a full stop. A red light halts the movement in one direction, and so does the period at the end of a sentence. Similarly, a colon acts like a four-way intersection where you wait a sec to see what’s coming next.
Interestingly, e. e. cummings was a student of Latin, Greek, and the classics, which apparently trained him well in using grammar, syntax, and punctuation. So it’s not that he misused the rules of English but studied them thoroughly to know when and where he could effectively break which and why and how.
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