In the story The Gift of the Magi O. Henry uses irony to develop the theme of the story by presenting us with two characters who are described as "silly" or "foolish", because they are young, in love, and living life with financial difficulties during the holidays: A time where everyone is bit by the fever of gifting, and buying things for others.
Within this context we get the biggest irony of all: They cannot find the way to please each other during the season, and their love for each other makes the other sacrifice things they like for the sake of making the other happy. In the end, they gave each other the same thing they sacrificed.
All this is a lesson on altruism and the things one does for love. It is a lesson also on how sacrifices become small when one does them for the right cause, and how getting things becomes unimportant in relationship to the happiness that they provoke in someone we love.
what is the theme of "the gift of the magi"?