Howard Becker, Sargasso Iceberg: A Study in Cultural Lag and Institutional Disintegration, American Journal of Sociology, Vol. 34, No. 3 (Nov., 1928), pp. 492-506 ...

Well, when you boil it down, Hemingway's Iceberg Theory is about showing rather than telling. And that's the number one rule of visual storytelling in film and TV.