Drawing a contrast asks your readers to make a comparison. Cyrus Habib, for example, begins his opinion column “Show Us the Money” by contrasting the everyday experiences of the blind with those of sighted Americans.

Blind Americans may soon find themselves able to use money just like anyone else. That is unless the Treasury Department is successful this month in its appeal of a recent federal court order that paper currency be made recognizable to the blind, who are currently unable to distinguish one denomination from another.