The New York Times recently featured an article exploring our current confusion about friendship. "Ask people to define friendship—even [experts who research friendship]—and you'll get an uncomfortable silence followed by "er" or "um."

"Friendship is difficult to describe," said Alexander Nehamas, a professor of philosophy at Princeton, who in his latest book, "On Friendship," spends almost 300 pages trying to do just that. "It's easier to say what friendship is not and, foremost, it is not instrumental." It is not a means to obtain higher status, wrangle an invitation to someone's vacation home, or simply escape your own boredom. Rather, Mr. Nehamas said, friendship is more like beauty or art, which … is "appreciated for its own sake."

Ronald Sharp, a professor who teaches a course on the literature of friendship added, "It's not about what someone can do for you, it's who and what the two of you become in each other's presence … The notion of doing nothing but spending time in each other's company has, in a way, become a lost art. People are so eager to maximize efficiency of relationships that they have lost touch with what it is to be a friend."