A sketchy ambiguity

The central dilemma of film compared to all other narrative media is that it's literal, in that what you see is what was literally there, and yet we as filmmakers in processing the narrative have to create a spaciousness, a sketchy ambiguity, that allows the audience themselves to piece it all together and make it powerfully their own. The danger of a well-made bad movie, in this sense, is that it crushes the imagination of the audience.

-Walter Murch (quoted in Lawrence Weschler's essay, "Valkyries Over Iraq")