I love reading and watching non-fiction because it never answers a question without raising many more. The process of learning and discovery is a never ending quest to slay the hydra. Every severed head—every answered question—only brings with it more heads to slay. This all brings me to an insight that occurred to me the other day after rewatching a Veritasium video on the discovery of the Principle of Least Action—for like the fifteenth time.

Perhaps narrative structures, stories, also obey this same principle.

Action, Briefly Explained

For those who don't know about the Principle of Least Action, you should watch the video—it's great. But in short, Action is a concept in physics. Specifically, it's the combination of mass, distance, and velocity, the minimization of which seems to underpin the motion of all objects in the universe. Action alone seems to determine the trajectory of objects in space, that is the path they take as they move.¹ In our modern theories of physics Action is fundamental, and Nature seems to do her best to minimize the expense of it.

A picture of a set of possible curves between two points on a 2-d plane. — A visualization of all possible paths a particle might take as it moves. Photo credit: Veritasium

Of all the possible paths that an object could take as it moves, it seems that objects in free-fall motion always move along the specific trajectory which minimizes the Action.

Narration viewed as Action

In writing there is a principle called Chekhov's gun, which states simply that:

If in the first act you have hung a pistol on the wall, then in the following one it should be fired. Otherwise don't put it there.

The point is to rid your story of extraneous elements. Detail must serve a narrative purpose; it must be justified. In a way, this is similar to the Principle of Parsimony (a.k.a. Occam's Razor) which is commonly paraphrased as, "of two competing theories, the simpler explanation of an entity is to be preferred." As a writer, your job is to craft a world and a narrative that fits disparate information together into a seamless whole. The better story is the one which requires fewer assumptions by the reader and omits extraneous information. This might be otherwise phrased as crafting a "tight" story. A tight story with a good ending is one that minimizes the information required for a reader to find the narrative and its completion engaging, one that ties up loose ends, and one that gives the reader the feel...

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