Form is play and content is serious. Form is light and content is heavy. The content of literature tends to be unhappiness. The only reason that people would continue to read poems and plays and stories by Chekov, O'Neil and Philip Larkin, whose content continues to be misery, is that the form of those plays, stories and poems provides happiness. We are form-loving and form-seeking creatures. We love symmetry. We love repetition. We love thematic. Some people would say that form and content are the same thing. Form is the manifestation of content. I think that's glib. Form is happy and content is miserable. It's the tension between those two that is the experience of literature.