Is all writing an interpretation of the human experience?

Yes. No matter what is written, someone out there has experienced it. The context that it is put in is how it's interpreted. You can't write about something that no one has experienced. It's not possible. The experience could be from real everyday life, or it could be taken from a dream. A person wouldn't write about something if it didn't effect them in some way.

Universal Shakespeare

Other movies based off of plays by Shakespeare:
Scotland, PA=Macbeth
Chimes at Midnight= The Merry Wives of Windsor
Get Over It= Midsummer's Night Dream

By creating movies based off of Shakespeare's plays, the writers have made them universal. The writers have broadened the audience of the plays. By putting some reference in the movies about Shakespeare, they have dropped a big hint.

If someone was just to watch the movies without reading the plays before, they wouldn't be able to make the connection. That's what happened to me with "O."